CTRE is an Iowa State University center, administered by the Institute for Transportation.

Address: 2711 S. Loop Drive, Suite 4700, Ames, IA 50010-8664

Phone: 515-294-8103
FAX: 515-294-0467

Website: www.ctre.iastate.edu/

Iowa State University--Becoming the Best

Research Projects by Keyword

3D imaging

3D modeling

3D models

3D photogrammetry

3D point clouds

3D visualization

4C-TempandStress

5DPM

5DPM implementation

A-wall design

A1010 bridge steel

A1010 steel girders

AASHTO

AASHTO HL-93 load requirements

AASHTOWare Pavement ME Design

Abaqus software

abatement

ABC alternatives

ABC components

ABC connections

abutment caps

abutment piling

abutments

accelerated bridge construction

accelerated construction

accelerometers

access management

accessibility

accident location and analysis

accident loss reduction factors

acquisition barriers

acquisition obstacles

acquisition process

active traffic management

adaptive control system

additives/stabilizers

advance warning systems

aerial photogrammetry

aggregate

aggregate blend

aggregate gradation

aggregate grayscale

aggregate material

aggregate roads

aggregate stabilization

aggregate stabilizing agents

aggregate testing

aggressive driving

aging drivers

aging mechanisms

agricultural traffic

agricultural traffic routes

air entraining agent

air pollution control

air quality

air traffic volume

air void analysis

air void analyzer

airport charges

airport economics

airport infrastructure

airport operations

airport revenues

airport service facilities

airport traffic volume

Alaska

alcohol

alcohol-related crashes

algorithm evaluation

alignment

alkalai-silica reaction

all-season surfaces

all-weather pavement markings

alternative fuel

Amish Sawmill Bridge

analysis tools

anchor pin placement

ANN

approximation modeling

APWA

arc routing problem

artificial intelligence

artificial neural networks

as-built survey

aspalt pavement recycling

aspalt pavements

asphalt additives

asphalt air voids

asphalt binders

asphalt cement concrete

asphalt concrete

asphalt density

asphalt emulsions

asphalt mixture compaction

asphalt mixture design

asphalt mixture evaluation

asphalt mixtures

asphalt pavement

asphalt pavement condition

asphalt pavement performance

asphalt pavement preservation

asphalt pavement rehabilitation

asphalt pavement repairs

asphalt roofing shingles

asphalt rubber

asphalt wearing surface

asphalt-rubber (AR)

assessment software

asset condition index

asset management

asset management tool

at-grade crossings

at-grade intersections

Aurora

autogenous shrinkage

automated

automated enforcement

automated manufacturing

automatic vehicle location (AVL)

autonomous process control

autonomous vehicles

axle weight limits

backfill compaction

backfill materials

backwalls

barrier rail construction

base characteristics

basket anchoring methods

bat roosting sites

battery electric vehicles

battery health management

battery systems

battery-powered vehicles

beam end corrosion

beam end retrofits

beam-end coatings

beam-end corrosion

BECAS

benefit assessment

berm

best practices

bicycle

big data analytics

bilevel optimization modeling

binder rheology

binders

bio-based polymers

bio-fuel waste binders

bio-oil

bio-oil binders

biobased fog seal

biocement utilization

biodiesel

biofuel

biofuel co-product

biogrout

biorenewable

bituminous roads

Black Hawk County

Black Hawk County, Iowa

blended cement

bolt tightening

Boone County

box beam joints

box girder bridges

bridge

bridge abutment bump

bridge abutment piles

bridge abutments

bridge approach

bridge approach guardrails

bridge assessment

bridge barrier rails

bridge cap connections

bridge capacities

bridge closure countermeasures

bridge components

bridge condition

bridge connections

bridge construction

bridge construction costs

bridge cost estimation

bridge damage detection

bridge deck deterioration

bridge deck flushing

bridge deck joints

bridge deck overlays

bridge deck placement

bridge deck rehabililation

bridge decks

bridge deep foundations

bridge design

bridge design costs

bridge design details

bridge design estimates

bridge design evaluation

bridge design guidance

bridge design methods

bridge design specifications

bridge deterioration

bridge element inspection

bridge elements

bridge engineering costs

bridge evaluation

bridge expanison joints

bridge field testing

bridge foundations

bridge girder rotation

bridge girders

bridge information models

bridge infrastructure

bridge inspection

bridge inspection planning

bridge instrumentation

bridge joint cracks

bridge joint details

bridge load ratings

bridge loads

bridge maintenance

bridge management system

bridge material costs

bridge monitoring

bridge movement

bridge piers

bridge pile capacity

bridge pile foundations

bridge pile stability

bridge piles

bridge preservation

bridge rating

bridge reconstruction

bridge rehabilitation

bridge renewal

bridge repair

bridge ride quality

bridge safety

bridge service life

bridge specifications

bridge speed limits

bridge structures

bridge substructure

bridge substructure protection

bridge substructure replacement

bridge superstructure

bridge transverse deck cracks

bridge truss verticals

bridge vulnerabilities

bridge X-frames

bridge-pavement interface

bridges

brine rates

Buchanan County Bridge

business

business vitality

bypass

CAD

calibration

calibration factors

calorimetry

cantilever test

capital improvement

CAPWAP

carbon footprint reduction

carbonate aggregates

carrier size

case-based reasoning

cast-in-place components

cast-on-site bridges

casting cement asphalt mixture

CDL fraud

cement hydration

cement soil stabilization

cement stabilization

cementitious content

cementitious materials

centerline markings

channels

charging stations

chemical stabilization

child restraint

chip seals

chloride ingress

chloride intrusion

chloride ion penetration

chloride penetration testing

chloride-contaminated runoff

chute spreader

City of Ames, Iowa

city planning

clear zone

climate change

climate resilience

closure rating formula

CM/GC issues

CMF

CMGC project delivery

CMR

coal fly ash

coarse aggregate

coarse aggregate porosity

coarse-graded mixes

cohesion

cohesive soils

cold in-place recycling

collaboration

collisions

Columbia, Missouri

combined gradation

commercial drivers licensing

commercial motor carriers

commercial vehicle operations (CVO)

commercial vehicle safety

commercial vehicles

communication

communications equipment

community traffic

commute

commuter routes

compacted fill

compactibility

compaction

compaction forecasting

Compaction Forecasting Expert Database

compaction moisture control

compaction monitoring

company drivers

complex project management

complex projects

complexity identification

complexity measurement

composite deck-girder system

composite pavement

composite prefabricated decks

compressive strength

computational simulation

computer vision

computer-aided

conceptual estimates

concrete

concrete beam ends

concrete bridge barriers

concrete bridge decks

concrete bridges

concrete crack repair

concrete damage

concrete durability

concrete joint deterioration

concrete joint maintenance

concrete joint restoration

concrete mix design

concrete mixtures

concrete moisture

concrete overlay

concrete pavement

concrete pavement condition

concrete pavement cracking

concrete pavement curling

concrete pavement durability

concrete pavement patches

concrete pavement specifications

concrete pavement thickness

concrete pavement warping

concrete pavements

concrete performance

concrete permeability

concrete repair

concrete sealing

concrete shrinkage

concrete shrinkage control

concrete shrinkage reduction

concrete strength

concrete sustainability

concrete temperature

concrete thermal damage

concrete water tightness

concrete workability

ConcreteWorks

condition assessment

condition index

condition monitoring

condition performance measure

conflict warning systems

congestion

connection details

connection testing

conspicuity

construction

construction contracting

construction cost index

construction data

construction engineer

construction management

construction manager-at-risk

construction materials and methods / asset management

construction noise

construction practices

construction project planning

construction safety

continuing education

continuity connectios

continuous deck

continuous monitoring system

continuous span design

contracts and project management

control chart

controller area network bus

corridor

corridor management

corrosion

corrosion quantification

corrosion resistance

corrosion sensors

cost assessment

cost comparison

cost estimates

cost estimating

cost-benefit analysis

cost-effective bridge life

cost/benefit analysis

Council Bluffs, Iowa

countermeasures

county engineer

county road

covered bridge

crack and seat

crack detection

crack filling

crack sealing

crack-relief interlayer

cracking

crash analysis

crash cushions

crash data

crash data analysis

crash injury severity

crash location

crash mitigation

crash modification factors

crash prediction model

crash risk factors

crash scene dynamics

crash severity mitigation

crash surrogate

creep

critical habitats

cross-hole sonic logging

cross-over countermeasures

crossing consolidation

crossing signs

crosswalk

crushed rock

culvert load ratings

culverts

curling

curve delineation

curve safety

curve speed safety

curve speed warnings

curved girder bridges

CWIMS

cyclic load tests

D-cracking

daily work report

damage

damage detection algorithm

damage predictions

damage prevention

damage-detection methodology

DARWin-ME

data

data analysis

data collection

data collection framework

data collection technologies

data fusion

data integration

data mining

data modeling

data requirements

data sharing

data-driven performance metric

database

Davenport

debris mitigation

decision support

decision support system

decision support tools

decision-making

decision-making tools

deck connections

deck crack mitigation

deck overlay performance

deck panels

deck service life

deck wearing surfaces

deer-vehicle

deflection

degree of saturation

deicer

deicer scaling

deicer scaling resistance

deicing

deicing PCC

deicing salt resistance

demonstration project

density

deployment plan

Des Moines Lobe landform

Des Moines, Iowa

design

design contracts

design factors

design guidance

design guide

design guidelines

design-build contracts

deterioration

deterioration predictions

deterioration prevention

detours

dewatering system

diaphragms

dielectric mood

diesel

differential speed limits

digital databases

digital elevation model

direct cost

disabled

disadvantage business enterprises

disaster relief

discharge regression equations

discrete-event simulation model

dispatching

distracted driving

distress

distributed framework

distribution

DOT

DOT project management

DOT vehicle fleets

dowel bar

dowel bar alignment

dowel baskets

drainage

drainage basins

drainage design guide

drilled shaft foundations

drilled shaft load tests

drilled shafts

driven bridge piles

driver age

driver behavior

driver braking behavior

driver education

driver safety

driver training

driver visibility

driving environment

driving performance

driving simulator

drop-off charges

dry cast

dual-lane axle spacing

dual-lane load

Dubuque County

durability

dust control

dust pallatives

dynamic advisory messaging

dynamic analysis

dynamic bridge loads

dynamic impact factors

dynamic load allowance

dynamic model

dynamic signs

early-age behavior

early-age deck cracks

early-age random cracks

early-age thermal loading

earth pressure cells

earth retaining walls

earth retention systems

earthwork

earthwork construction

earthwork quality

earthworks

earthworks construction

economic

economic analysis

economic development

economic impact

economy

edge drop-off

edge-rut mitigation

edgeline markings

education

elderly

elderly drivers

electric vehicles

electrical vehicle systems

electrochemical fatigue sensor

electromagnetic induction

electronic credentials

electronic database

electronic document management

electronic signs

elliptical steel dowel

emabankment construction

embankment construction

embankment soils

embankments

embedded steel corrosion

emergency

emergency management

emergency response

eminent domain

emission

emissions

emulsion rheology

emulsion viscosity

end bearing

endangered bat species

energy

energy effieciency

energy harvesting

enforcement

engine efficiency

engineering analysis

engineering estimates

engineering management

engineering resilience

engineering services

enhanced signs

entrained air void system

environment

environmental impact

EPA MOVES

equipment fleets

equipment lifecycle optimization

equipment maintenance cost

erosion

essential air services

essential services

estimating methodologies

estimating model

evaluation and assessment

Everyday Counts initiative

excavation technology

Excel spreadsheet

Excel worksheets

expansion joint design

expansion joint replacement

expansion joints

expected sign life

experiential learning

exploratory visual analytics

expressway

extended deck life

exterior bridge girders

extreme events

extreme rainfall

factors for success

failure to yield

failure-critical joints

falling weight deflectometer

false-indication rate

farm equipment

farm-to-market roads

fast pyrolysis

fatigue cracking

fatigue load testing

feasibility study

fiber composites

fiber optic systems

field data collection

field performance

field performance tests

field safety audit

field testing

field testing methods

file conversion

financial model

financial sustatinability

finger plate designs

finite element analysis

finite element model

firm size

fixed object cushions

fixed object setback

fleet composition

fleet management

fleet operations

flexible pavements

flexural capacity

flood damage

flood estimation

flood mitigation

flood planning

flood protection

flooded backfill

flow of goods

flowability

fly ash

FMCSA safety initiative

fog seal performance

fog seals

folded plate girders

food distribution

football game travel

forested wetland mitigation

foundation stabilization

foundations

fractionation methods

freeway interchanges

freeway merge/diverge

freeway operations

freeway ramps

freeway traffic sensosrs

freeze-thaw

freeze-thaw condition

freeze-thaw damage mitigation

freeze-thaw deterioration

freeze-thaw durability

freeze-thaw performance

freight

freight analysis framework

freight industry forecasts

freight movement

freight transportation

friction

friction coefficients

frost boil mitigation

frost heave

FRP materials

fuel

fuel consumption

fuel economy

full-depth reclamation

full-depth reclamation with cement

fund allocations

FWD

galvanized steel bridge

gantry cranes

geo-materials

geo-materials stabilization

geo-spatial

geocell reinforcement

geographic information system (GIS)

geographic information systems

geogrid

geomaterial applications

geopolymer-based UHPC

geostatistics

geosynthetic

geosynthetic reinforcement

geosynthetic-reinforced soil

geosynthetic-reinforced soil abutments

geotechnical

geotechnical asset management

geotechnical risks

geotechnical solutions

geotechnical treatments

giant magnetoresistance sensor

gland installation

glass beads

global positioning system (GPS)

glued-laminated

glued-laminated timber

glulam girder bridges

grading projects

graduated licensing

grain

granular backfill

granular-surfaced roads

gravel road safety

gravel road stabilization

gravel roads

gravel shoulders

gravimetric method

green concrete

green strength

ground improvement

ground transportation

ground transportation subsidy

ground versus air subsidy

ground-penetrating radar

groundwater monitoring wells

groundwater system impacts

groundwater table

grouted coupler connections

grouted couplers

GRS abutments

GRS-IBS

gyratory compaction

hardened cement paste

haul-truck cycle time

head-on crash reduction

headway

health care

heat capacity

heat signature

heavy truck safety

HEC-RAS models

high friction surfaces

high performance

high risk locations

high wind closures

high wind events

high-performance concrete

high-performance concrete decks

high-performance mortar

high-speed pavement analyzer

high-speed roadways

high-speed rural intersections

high-speed traffic gaps

high-speed video

high-strength bolts

high-strength concrete

highway

highway bypass

highway construction

highway construction contracts

highway construction impacts

highway construction risk

highway design

highway incident mangagement

highway infrastructure

highway maintenance

highway maintenance activities

highway mobility models

highway noise

highway pavements

highway planning

highway safety

Highway Safety Manual

highway traffic conditions

Highways for LIFE

HIPERPAV

Hispanic

hispanic workforce integration

historic preservation

historical data mining

HMA mix stability

horizontal curve safety

horizontal curves

horizontal displacement

hot mix asphalt

human factors

husbandry implements

hybrid bus

hybrid concrete

hybrid delivery systems

hybrid linear regression models

hybrid traffic detection

hybrid vehicles

hydropower facility concrete

I-235

I-380

I-girder

IA Highway 28

IA Highway 9

ICPA

IDIQ contracts

IDIQ framework

ignition interlock devices

illuminance

image analysis

image verification

image-based crack detection

image-based data collection

impact echo

impact frequency

implements of husbandry

in situ characterization

in situ testing

in-place pavement recycling

in-situ testing

incident location tool

indirect cost

information technology

infrastructure

infrastructure decision tree

infrastructure degradation

infrastructure vulnerabilities

initial concrete set

initial cost-benefit

initial set

injury severity reduction

inland water transportation

inner-city planning

innovative bridge construction

innovative contracting

innovative project delivery

innovative technologies

INRIX data

inspection

inspection standards

inspection strategies

inspector's daily report

installation practices

instantaneous camber

institutional barriers

insurance

integral abutment

integral abutment connections

integrated bridge systems

integration

intelligent compaction

intelligent transportation systems (ITS)

interbus transfer

intercity ground service

intercity traffic volume

intermodal

intermodal facilities

intermodal freight

internal curing specifications

internally cured concrete

internship program

intersection conflict analysis

intersection conflict assessment

intersection conflict countermeasures

intersection conflict warning

intersection crash mitigation

intersection geometry

intersection lighting

intersection safety

intersection skew angle

intersections

interstate

interstate safety

inventory management

investment

investment plans

Iowa

Iowa agricultural economy

Iowa bridge monitoring

Iowa CHSP

Iowa DOT

Iowa DOT pavements

Iowa Falls bridge

Iowa highway safety

Iowa highways

Iowa law

Iowa pavements database

Iowa pore index

Iowa pore index test

Iowa public employees

Iowa public works

Iowa road work

Iowa soils

J-turn

J-turn design

JET Filter drains

job-site communications

job-site traffic control

Johnson County

Johnson County, Iowa

joint deterioration

joint repair

joint replacement

joint seal termination

joint spacing

jointed concrete pavement

joints

Kadyn's Law

Kansas

Kansas City

Keg Creek Bridge

labor force

laboratory compaction testing

laboratory testing

land use

lane change

lane closures

lane conversion

lane departure

lane departure countermeasures

lane drop signing

lane reconfiguration

lane-departure countermeasures

lane-departure crash mitigation

language barriers

large commercial trucks

laser scanning

lateral earth pressure

lateral live load distribution

lateral pressure

law enforcement

leadership academy

leadership institute

LED signs

Lee County, Iowa

left turn phases

levee protection

library

LIDAR

life-cycle analysis

life-cycle cost analysis

life-cycle costs

lifecycle cost analysis

light weight deflectometer

lighting

lighting measurements

lightweight aggregate

lightweight fine aggregate

lignin

lime sludge

limestone fines

linear referenced data

linear referencing

linear regression-neural networks

literature review

lithium-ion batteries

Little Silver Creek Bridge

live bridge loads

live load distribution

live load testing

Load and Resistance Factor

load distribution factors

load factors

load permits

load resistance factor design

load restrictions

load testing

load transfer

load-transfer mechanisms

local agency assistance

local climate

local damage quantification

local government

local government agencies

local pavement management

local pavement preservation

local road safety

location

lock and dam

logistics

long-term camber

longitudinal bridge joint

longitudinal cracking

longitudinal joint

longitudinal vibrator trails

Louisa County, Iowa

low volume

low volume roads

low water stream crossing

low-asphalt-binder content

low-cost autonomous sensing

low-cost improvements

low-cost rural surfaces

low-temperature cracking

low-volume bridges

low-volume roads

lower-cost treatments

LRFD

lump sum delivery

machine energy

machine vision

macroscopic measurements

Madison County

magnetic flux leakage

maintainable drains

maintenance

maintenance costs

maintenance operations

maintenance planning tool

maintenance strategies

management information system

management system

management training

MAP-21

mapping

marking durabililty

marking removal

marking retroreflectivity

Marshall County, Iowa

mass concrete construction

mass transit

material-related distress

maturity

MDA

measurement device

measurement influence depth

median cable barriers

medium-sized communities

MEPDG

mercury intrusion porosimetry

merge practices

metro traffic congestion

metropolitan planning

micro surfacing

Micro-Electromechanical Sensors

micro-piles

micro-simulation model

microsimulation

microsimulation model

Microsoft Office software

MiniCym

minimum reinforcement

MiniSim

Minnesota

minorities

Mississippi rail crossing

Missouri

Missouri data calibration

mitigation

mix

mix design

mix evaluation

mixture design analysis

mixture optimization

mixture proportioning

mixture test methods

mobile data collection

mobility

model calibration

modeling

modified Iowa ENR formula

modular

modulus of elasticity

moisture control criteria

moisture ingress

moisture sensitivity

moisture sensor technologies

moisture-induced damage

moisture/density control

monitoring hardware

motor carrier credentials

motor carrier freight

motor carriers

motor vehicle enforcement

motorcycle

motorcycle clothing

motorcycle headlights

motorcycle safety

motorcycle torso

Moving Ahead for Progress

moving work zones

multi-disciplinary

multi-method analysis

multi-sensor monitoring

multi-span jointless bridges

multi-splicing

multidisciplinary safety teams

multimodal

multimodal transportation

multiple regression analysis

Muscatine

Muscatine County

Muscatine County, Iowa

MUTCD

narrowing

National Bridge Inspection

National Bridge Inventory

National Highway System bridges

natural pozzolans

naturalistic driver behavior

naturalistic driving study

naturalistic driving study data

NDE

NDT

Nebraska

negative moment reinforcement

network equilibrium

network functionality

next generation timber bridge

nighttime traffic safety

non-destructive detection

non-destructive evaluation

non-destructive testing

non-freeway road segments

non-invasive traffic detection

non-nuclear technologies

non-signalized intersections

non-uniformity

nondestructive testing

normal-strength concrete slab

Northeast Iowa

nuclear method

O/M equipment

O/M technologies

oblonging

older drivers

on-board diagnostics logging

on-pavement curve markings

one-lane flagging operations

one-way street

operation costs

operations and maintenance

optimal garage location

optimal replacement model

optimization

optimization models

optimum binder content

orthotropic steel deck

Ossian Season One

Otta seals

overconsolidation

overland drainage

overlay

overlay chloride migration

overlay construction

overlay curing time

overlay performance

overlay performance database

overlay placement time

overlay service life

overlays

overlays under traffic

oversize permits

overweight permits

OWI

owner-operators

parametric study

paratransit

parking

partially grouted revetment

particle tracking velocimetry

partnering

passenger transportation

passenger vehicles

paste content

paste quality

patch repair

paved shoulders

pavement

pavement albedo

pavement analysis

pavement assessment

pavement base

pavement condition

pavement condition monitoring

pavement construction

pavement cracking data

pavement cracking standards

pavement curing

pavement curling

pavement damage

pavement deformation

pavement design

pavement durability

pavement edge drop-off

pavement evaluation

pavement foundation layers

pavement foundations

pavement friction

pavement health monitoring

pavement joints

pavement loadings

pavement maintenance

pavement management

pavement management systems

pavement management tool

pavement marking degradation

pavement marking installation

pavement marking materials

pavement marking performance

pavement markings

pavement mix

pavement mix design

pavement modeling

pavement noise

pavement performance

pavement preservation

pavement profile

pavement rating

pavement rating tool

pavement rating tools

pavement rehabilitation

pavement repair

pavement resurfacing

pavement roughness

pavement saw-cutting

pavement service life

pavement settling

pavement shrinkage

pavement smoothness

pavement striping

pavement subdrains

pavement survey

pavement thermal model

pavement treatment application

pavement treatment selection

pavement treatments

pavement warping

PCC overlays

PCC pavement construction

PCC pavements

PDA

pedestrian

pedestrian crossings

pedestrian safety

pedestrian-activated signs

peer exchange

performance

performance evaluation

performance indicators

performance measure

performance measures

performance metrics

performance models

performance monitoring

performance properties

performance tests

performance-based management

permeability

permitted vehicles

personal development

pervious concrete

petrochemicals

photogrammetry

physical displacement

pick-up charges

pier diaphragms

pile cap connections

pile couplers

pile load tests

pile strengthening

pilot project

pilot SHM project

planning

planning models

plate fatigue

plug-in electric vehicles

plywood overlay

PMIS

pole footing design

policy

pollution

polymer concrete overlays

polymer deck overlays

polymer overlay placement

polymer-modified emulsion

polymerization

polymers

PONTIS

pooled fund study

popout

pore pressure

pore size distribution

pore/void structure

portable device

portland cement concrete

portland cement concrete pavement overlays

post-mounted delineators

post-tensioned

post-tensioned concrete

post-tensioning

PPCB end rehabilitation

pre-tensioned concrete

pre-wetting rates

precast bridge components

precast concrete

precast concrete beams

precast concrete bridges

precast connections

precast pretensioned concrete

precast systems

precipitation change

preconstruction services costs

predictive performance model

preservation

preservative treatments

prestressed beams

prestressed concrete bridges

prestressed concrete girders

prestressed girder bridges

prestressing

prestressing strands

pretension

pretensioned prestressed concrete

probe data streams

process improvements

proctor compaction

procurement

product evaluation program

program effectiveness

project bid documents

project cost estimating

project delivery

project estimating

project funding

project management

project scaling

Project Scheduling System

prototype

public transportation

public works

public-private partnership

quality assurance

quality assurance tools

quality control / quality assurance

quantile regression

queuing model

radio frequency identification

radiography

rail crossing benefits

rail freight

rail freight costs

rail-highway crossings

railroad

railroad crossings

railroad flatcars

railroad workers

railroads

railway infrastructure

rammed aggregate piers

ramp meters

Random Forests predictions

RAP content

rapid construction

rapid rehabilitation

rapid repair

rapid-flash beacons

rating system

real time

real-time prediction

real-time traffic conditions

rear-end crashes

rebar corrosion

recidivism

recruiting

recycle

recycled asphal pavement

recycled asphalt pavement

recycled PCC

recyled asphalt shingles

red light

red light cameras

red light running

reduced conflict intersections

reduced speed countermeasures

reference manual

reflective cracking

regional planning

regulation

regulatory issues

regulatory requirements

regulatory traffic signs

rehabilitation

rehabilitation treatments

reinforced fills

reinforced joints

reinforcement

reinforcing steel evaluation

remote monitoring

remote sensing

removable paint markings

renewable fuel

repair

replacement blends

research planning

resilience measure

resilience measures

resilient modulus

resillience

resillience indices

resistance factors

resonance frequency

resonant vibrations

resource allocation

resource planning

retaining wall drainage

retaining wall maintenance

retroreflective treatments

retroreflectivity

return on investment

rheological properties

rheology

RICM evaluation

ride quality improvement

ridesharing

right-of-way acquisition

risk assessment

risk management

risk mitigation

risk-based estimating

risk-based inspection

risk-based management

river analysis

river flood basins

rivers

RMS

road assessment

road closures

road construction

road construction plans

road construction risk

road construction traffic

road departure

road departure factors

road diet

road equipment

road maintenance

road maintenance operations

road repair

road safety

road safety audit

road smoothness

road use tax fund

road weather information system (RWIS)

roadside features

roadside inventory data

roadside safety analysis program

roadsides

roadway

roadway asset management

roadway departure

roadway design

roadway embankment

roadway embankments

roadway geometry

roadway information database

roadway infrastructure

roadway lighting poles

roadway maintenance

roadway management

Roadway Monitoring System

roadway rehabilitation

roadway surfaces

roadway treatments

roadwork risk modeling

robots

roller

roller compacted

roller-compacted concrete

rough surfaces

round dowel

roundabouts

ROW acquisition

rubblization

rumble stripes

rumble strips

run-off-road countermeasures

run-off-road crash mitigation

run-off-road crashes

runoff

runoff containment

rural

rural air service

rural conspicuity

rural growth

rural intersections

rural Iowa roads

rural multi-lane highways

rural multi-lane intersections

rural population

rural road safety

rural roads

rural sociodemographics

rural traffic control

rural traffic safety

rural transitions

rural transportation service

rural transportation subsidy

rural two-lane highways

rural two-lane intersesctions

Rustic Road GRS-IBS

rutting resistance

RWIS

Sabula Iowa bridge

sacrificial specimens

SAFETEA-LU

safety

safety analysis process

safety belts

safety corridors

safety countermeasures

safety culture

safety edge technology

safety improvements

safety perfomance functions

safety performance

safety performance assessment

safety planning

safety programming

safety synthesis

safety treatments

Saint Louis

salt delivery methods

salt retention

salt spreader comparison

salt truck application speeds

Saylorville Reservoir Bridge

scanning electron microscope

scanning laser

SCC

scenic byway

schedule

school bus

school bus safety

school zone

Scott County

SDCWS

seal coats

seat belt

second-generation ABC