CTRE  en route
Summer 2005

CTRE en route is published twice a year to inform readers about CTRE's projects and programs.



Address: CTRE, 2901 S. Loop Drive, Suite 3100, Ames, IA 50010

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

Website: www.ctre.iastate.edu/

CTRE Communications:
Marcia Brink
CTRE en route editor:
Michele Regenold

CTRE is an Iowa State University center.

Iowa State University: Becoming the best

Recently completed research

Below is a list of projects that were completed between February 2005 and July 2005. All links will take you off site.

CTRE projects

  • Safety Impacts of Street Lighting at Isolated Rural Intersections
    This study was initiated to evaluate the effectiveness of rural street lighting in reducing nighttime crashes at isolated rural intersections so that Minnesota agencies have more information to make lighting decisions.
  • Cost Comparison of Treatments Used to Maintain or Upgrade Aggregate Roads
    This report describes a research project that provides Minnesota counties, and townships with information and procedures to make informed decisions on when it may be advantageous to upgrade and pave gravel roads.
  • Identification of the Best Practices for the Design, Construction, and Repair of Bridge Approach Sections
    Bridge approach settlement and the formation of the bump is a common problem in Iowa that draws upon considerable resources for maintenance and creates a negative perception in the minds of transportation users. This research study was undertaken to investigate bridge approach problems and develop new concepts for design, construction, and maintenance that will reduce this costly problem.
  • Iowa Drainage Law Manual
    To assist property owners, public agencies, and others with interest in better understanding drainage maintenance responsibilities, a reference manual was developed to describe Iowa's drainage laws and offer interpretations in a clear and concise manner.
  • Development of a Method to Determine Pavement Damage Due to Detours
    The research presented in this report provides the basis for the development of a new procedure to be used by the Iowa DOT and cities and counties in the state to deal with detours.
  • Review of Stability Berm Alternatives for Environmentally Sensitive Areas
    The purpose of this project was to review existing stability berm alternatives for potential use in environmentally sensitive areas. The project also evaluates how stabilization technologies are made feasible, desirable, and cost-effective for transportation projects and determines which alternatives afford practical solutions for avoiding and minimizing impacts to environmentally sensitive areas.
  • Implementing the Mechanistic-Empirical Pavement Design Guide (MEPDG)
    This project includes an implementation plan to help state DOTs effectively and efficiently transition to the M-E Pavement Design Guide and a report that outlines the technical aspects of the new MEPDG.

Construction Management & Technology projects

Bridge Engineering Center projects

Midwest Transportation Consortium projects

Center for Portland Cement Concrete Pavement Technology projects

  • Long Term Plan for Concrete Pavement Research and Technology (Task 15)
    A new long term plan for concrete pavement research to chart the path from the current state-of-the-practice to a new generation of concrete pavements that are affordable, constructible, safe, reliable, durable, and renewable.
  • Soil Stabilization of Non-uniform Subgrade Soils
    This project report is in two volumes: (Volume I) Engineering Properties and Construction Guidelines and (Volume II) Influence of Subgrade Non-Uniformity on PCC Pavement Performance.
  • Measuring Pavement Profile at the Slip-form Paver
    In an attempt to correct the inconsistency between measuring techniques, lightweight profilers intended to produce values to be used for construction acceptance are being made that measure the same profile as high-speed inertial profilers. Currently, two profiler systems have been identified that can measure pavement profile during construction. This research has produced a field evaluation of the two systems.
  • Field Evaluation of Elliptical Fiber Reinforced Polymer Dowel Performance
    Iowa State University has completed a large amount of laboratory research to determine the diameter, spacing, and durability of FRP dowels. This report documents the performance of elliptical FRP dowels installed in a field situation.