Research Publications

This project answers pertinent questions for officials to consult if they are considering a lane conversion in their communities.

Project examined the impact of increased legal axle loads on bridges in Iowa. The testing results indicated that the load and resistance factors in the current AASHTO designs do not require an update.

An evaluation of a custom-developed analytical framework designed to identify and quantify bridge cracks, spalling, and other infrastructure defects

A sampling of the nearly 200 research projects that are in process or recently completed grouped by the four focus areas.

The study’s findings immediately inform pavement engineers about overlay designs to maximize the benefits of FRC for Iowa pavements.

This project will compare the safety outcomes and driving performance of parent-taught and traditionally educated teen drivers.

SWZDI provided recommendations to optimize Speed Feedback Trailer (SFT) use and increase safety.

Five states from different regions of the United States pooled their knowledge and financial resources to research and test innovative culvert configurations.

Iowa DOT investigated when UHPC closure joints reinforced with noncontact lap-spliced rebar could be subjected to vehicular or construction loading.

Researchers developed machine learning tools to evaluate road images for snow coverage and estimate road surface conditions across a highway network.

This project developed a methodology to quantify the impacts of superloads on the structural integrity of Iowa roads.

This study demonstrates the performance properties of eggshell powder as a soil-stabilizer, with data confirming the best processing method.

This pooled fund is a collaborative program between state DOTs and the Midwest Roadside Safety Facility dedicated to sponsoring roadside safety research.

This project will monitor the construction process of a new concrete bridge deck which uses a concrete additive intended to limit water intrusion.

This pooled fund facilitates and supports successful tech transfer of maintenance-related innovations among member states.

This study looked at ways to impact safety culture, leading to safer roads with fewer crashes and fatalities.

This project evaluated different combinations of lane widths and shy distances in work zones to determine dimensions that improve safety and mobility outcomes.

From this analysis, Iowa DOT updated their specification to establish different requirements based on the duration and complexity of the construction.

This is a summary of IHRB research activity in 2024.

This project is preparing Iowa DOT and other agencies for quick and complete adoption of new methodologies and resources in the updated Highway Safety Manual.