Treating roads with deicers during winter storms is essential for ensuring the safety of the traveling public. However, salt runoff can negatively impact the environment. In-ditch salt capture techniques may limit the migration of salt from roads into watersheds.
Continue reading Permeable Barriers for Absorbing Road Salt RunoffMotorists driving dangerously in work zones present a safety risk to workers and themselves. Alerting these drivers about their driving behavior before they reach the work zone could reduce the number of work zone crashes and enhance work zone safety. This project developed and evaluated the performance of a device that provides audio and visual alerts to drivers whose vehicles are approaching work zones at a high speed and on a dangerous trajectory.
Continue reading Alerting Drivers Dangerously Approaching Work ZonesCulverts are essential components of urban and rural infrastructure that guide and channel water under roads and embankments. The most common failure affecting culverts is joint separation between segments of the concrete pipes. This project examined the predictors and factors that lead to joint separations in culverts to determine practices that will decrease future separations.
Continue reading Strategies to Prevent Joint Separations in CulvertsTo enhance pedestrian safety at intersections, transportation agencies may install temporary or permanent infrastructure such as curb extensions or pedestrian refuge islands. While more permanent infrastructure with concrete is generally considered effective, specific details about temporary infrastructure with flexible delineators (or bollards), such as installation, use and safety impact, would be valuable to optimize cost-effectiveness. This project evaluated both temporary and permanent pedestrian infrastructure at crossing sites to measure the effects on pedestrian safety and driver behavior.
Continue reading Evaluating the Safety Impacts of Select Pedestrian InfrastructureThe Center for Transportation Studies at the University of Minnesota has called for speakers. If you have recently completed or participated in an innovative transportation-related research, implementation, or engagement activity, consider sharing your work in a presentation at the 2026 CTS Transportation Research Conference!
Continue reading Call for Presentations: 2026 CTS Transportation Research ConferenceCold recycling road pavement materials into new road construction is a cost-effective and sustainable practice. However, the properties of these materials must be characterized to adequately design pavement structures. This project developed a framework and tool for transportation agencies to estimate the key material properties of cold recycled materials incorporated into road designs.
Continue reading Assessing Recycled Pavement for Use in Road DesignFebruary 25, 2025, 10-11 AM CST
TRB is offering a free webinar tomorrow on rural mobility, which has been a focus of a number of MnDOT studies in the last few years. For a review of research on rural mobility in Minnesota, see the following lists of completed and active projects. To register for the webinar, follow the link above.
Continue reading TRB Webinar: Improving Mobility in Rural and Tribal CommunitiesMany modern vehicles continuously track location and performance data such as speed and acceleration. Collecting large amounts of this data to use in machine learning models has many potential applications, including aggregating and evaluating road pavement conditions. This project investigated the feasibility of using large amounts of onboard data from electric vehicles to monitor and assess pavement conditions comprehensively and cost-effectively across a large network.
Continue reading Using Onboard Vehicle Data to Assess Pavement QualityPost-construction soils can produce much higher stormwater runoff rates than pre-construction or typical vegetated soils. Poor soil conditions can hinder the establishment of vegetation and carry large volumes of runoff, sediment, and nutrient loads to local waters. Organic soil amendments (composts) may support post-construction vegetative growth by boosting soil structure, nutrient availability, and water holding capacity.
This research aims to define targeted pre-construction soil health baselines, determine optimized design and field implementation inputs that return soils to baseline health indices using organic amendments, and identify how these inputs can benefit transportation requirements and resilient stormwater treatment.
The results may facilitate the quantification of benefits provided through soil health restoration and the development of implementable guidance for roadside soil health restoration techniques.
“This research project will help us understand how implementing soil health practices can improve the performance of roadside vegetation establishment resulting in MnDOT being able to close out construction contracts and stormwater permits sooner,” said Warren Tuel, Natural Resources Program Coordinator with MnDOT’s Office of Environmental Stewardship. “There are also significant potential stormwater benefits of soil health practices including increased infiltration, improved treatment of pollutants present in highway stormwater runoff. The improved management of stormwater will result in improved water quality of runoff from MnDOT highway systems resulting in greater protection of the many water resources here in Minnesota.”
The objectives are:
Project Details
Details of the research study work plan and timeline are subject to change.
To receive email updates about this project, visit MnDOT’s Office of Research & Innovation to subscribe.
While studies have shown that salt brine can be less expensive and better for the environment than granular salt, public perception maintains that salt brine is less efficient and less safe for travelers.
In this Clear Roads project, researchers developed metrics for comparing the two different forms of salt and conducted a variety of tests to measure their performance in the field.
Now, agencies have data and infographics they can use to support their decision to use salt brine in place of granular salt.
Download the final report and two-page brief: CR 22-04 – Evaluation of Direct Liquid Application of Salt Brine vs Granular Salt as Measured through Various Performance and Safety Metrics, December 2025.
Reprinted from Clear Roads news, January 21, 2026.
Crossroads 