The National Road Research Alliance (NRRA) is hosting “Performance Benefits of Fiber-Reinforced Thin Concrete Pavement and Overlays” on September 21 at 10 a.m. CST, presented by Manik Barman, University of Minnesota Duluth.Continue reading Research Pays Off Webinar Series: Performance Benefits of Fiber-Reinforced Thin Concrete Pavement and Overlays
Pavement markings contain glass media to provide retroreflectivity. These markings are slipperier than surrounding pavement. The sudden difference in friction between pavement and pavement markings can create a safety hazard for pedestrians (including those with disabilities), bicyclists and motorcyclists, especially during wet conditions.Continue reading New Project: Pavement Marking/Colored Pavement Friction Differential and Product Durability
Early preventive maintenance of concrete pavement—maintenance performed in the first five to seven years of pavement life—is a low-cost way to increase pavement service life. But no quantitative evaluations of service life extension have been conducted that compare early intervention to late or no intervention.
Without these comparisons, meaningful determinations of pavement life extension operations cannot be made. Federal Highway Administration (FHWA) research has found that agency projects focused on the end-of-service life may redirect funds from rehabilitation projects that could improve overall system quality.Continue reading New Project: Benefits of Preventive Concrete Pavement Maintenance
Intersections can be controlled through pretimed systems or vehicle-actuated systems, which detect the presence of a vehicle. Good vehicle detection is the foundation of actuated systems. While loop detectors have been effective workhorses of vehicle detection for MnDOT, changes in vehicle fleets—for example, the use of nonferrous materials—and an increased need to detect vulnerable road users has resulted in an increased use of nonintrusive detection technologies (NIT).Continue reading New Project: Performance Evaluation of Detection Technologies for Signalized Intersections in Minnesota
Understanding pedestrian and bicyclist flows is vital to distributing a limited construction budget to new infrastructure for improved safety on specific roads. Unfortunately, statewide data collection for active transportation flows is challenging.
MnDOT and local agencies historically have lacked estimates of bicycle and pedestrian traffic on Trunk Highways and County State Aid Highways.
Since about 2016, MnDOT has begun monitoring bicycle and pedestrian flow at more than 25 locations across the state, but, given the small number of counters and the variability of flows in response to variations in weather across Minnesota, these monitoring data are insufficient for estimation of Annual Average Daily Bicyclists and Annual Average Daily Pedestrians.
One option for obtaining travel data without expensive infrastructure is relying on mobile data collection.Continue reading New Project: Mobile-Device Data, Non-Motorized Traffic Monitoring, and Estimation of Annual Average Daily Bicyclist and Pedestrian Flows
As autonomous vehicles (AVs) become increasingly more numerous on roadways, they have the potential to substantially alter traffic flow. New vehicles today have many driver-assisting (or SAE Level 1) features—such as adaptive cruise control, parking assistance, collision avoidance, emergency braking and lane-keeping assistance—which still require a hands-on driver. However, as technology advances toward eventual SAE Level 4 automation, vehicles will be able to function without drivers, which will likely change the shape of traffic flow.Continue reading New Project: Influence of Autonomous and Partially Autonomous Vehicles on Minnesota Roads
It’s often more difficult for motorists to see road edge-lines and centerlines on rainy nights, especially in rural areas with limited lighting.Continue reading Pavement Marking Standard Project Earns National Recognition
Join the Center for Transportation Studies for a day of discovery and innovation at this year’s Transportation Research Conference, scheduled for November 4, 2021, at the Graduate Minneapolis Hotel. The annual event will convene researchers and practitioners to explore the latest innovations in transportation research, implementation efforts, and engagement activities.Continue reading Save The Date: 2021 CTS Transportation Research Conference
Building on previous MnDOT-sponsored work, researchers have developed a nondestructive method of assessing pavement thickness using 3D ground-penetrating radar (GPR). A vehicle equipped with an array of transmitting and receiving antenna pairs travels at traffic speed collecting full-width GPR data for analysis, minimizing the amount of pavement coring required.Continue reading Evaluating Pavement Thickness With 3D Ground-Penetrating Radar
Using an earlier lane departure warning system (LDWS) that employs standard GPS data rather than expensive cameras or maps, Minnesota researchers have enhanced and refined the system, moving closer to an affordable product to warn drivers about dangerous lane drift and approaching curves.Continue reading Improved In-Vehicle Lane Departure Warning System Approaches Commercial Use