This article was originally published in Catalyst, May 2020.
Many of us would never drive after drinking, but we’re not as hesitant about getting behind the wheel after being awake for too long or not getting enough sleep. It turns out that can be just as dangerous as driving while impaired by alcohol or drugs.
Continue reading Get Lots of Sleep—But Not Behind The WheelThis article was originally published in Catalyst, May 2020.
Waymo and Uber have started trials of shared autonomous vehicle (SAV) service in several US cities. Without the expense of drivers, autonomous service could one day make the cost of a ride so low that people choose SAVs for their daily transportation needs instead of owning a vehicle.
Continue reading Shared Autonomous Vehicles: Dispatch Model Optimizes ServiceCities and counties need affordable pavement preservation treatments, but preservation strategies are often geared towards higher-volume roads. The Minnesota Local Road Research Board has developed new guidance on five lower-cost treatments that is more applicable to local agencies and can be used to preserve pavements based on the type and severity of pavement distress.
Continue reading Pavement Preservation Techniques for Local AgenciesReinforced concrete bridges are built to handle heavy loads and routine traffic for 75 years or more. But bridges in climates like Minnesota’s are exposed to moisture and chlorides from road salts that may penetrate these structures and corrode the steel.
In a recently completed research project, funded by MnDOT and the Local Road Research Board, researchers studied a rural bridge built in 2017 near Elgin, MN, that used glass fiber–reinforced polymer (GFRP) rebar in the bridge deck. They found that GFRP performed well, proving sufficiently strong for use as an alternative to corrosion-susceptible steel rebar.
Continue reading GFRP Rebar Shows Promise for Use in Bridge DecksJust in time for spring, new guidance is available from the Minnesota Local Research Board on the best irrigation methods to establish fresh turfgrass. Researchers tested five irrigation methods for watering new installations of salt-tolerant turfgrass. They developed an instructional course for contractors and guidance for homeowners to promote successful turfgrass installation.
Continue reading Improving Roadside Turfgrass EstablishmentA newly developed system helps traffic engineers quickly spot failing loop detectors, which are used to monitor traffic volumes on Minnesota highways. The software program, developed by the University of Minnesota-Duluth for the Minnesota Department of Transportation, evaluates loop detector data and reports current loop detector health in an easy-to-read graphic format, making it easy to identify loop detectors in need of repair and which loop detectors should be used for the most accurate traffic counts.
Continue reading Improving Traffic Volume Estimates By Monitoring Health of Loop DetecTORSThis article was originally published in Catalyst, April 2020.
The Minnesota Department of Transportation (MnDOT) is exploring innovative ways to filter pollutants from stormwater runoff and meet permit requirements for construction projects. In a recent study, U of M researchers documented the performance of an iron-enhanced ditch check filter to remove phosphates from stormwater. They found that the filter was effective, though its performance decreased over time.
Continue reading Redesigned iron-enhanced ditch checks could help filter pollutants from stormwater runoffRural intersections account for 30% of crashes in rural areas and 6% of all fatal crashes, representing a significant but poorly understood safety problem.
Transverse rumble strips are one low-cost measure that some states have deployed to reduce rural intersection crashes.
Continue reading Transverse Rumble Strips: Another Tool for Rural Road Safety?This article was originally published in Catalyst, April 2020.
Vibrant green grass along roadways is a common sight across urban and rural landscapes in Minnesota and many other states, but its survival is a significant challenge—especially in cold climates. Roadway salt and other stressors can cause turfgrass installations to fail, requiring expensive reseeding or sodding efforts.
Continue reading Regional effort tests turfgrass performance in cold climate statesThe Minnesota Local Road Research Board (LRRB) has added pavement condition forecasting technology to an existing, web-based roadway inventory tool that will enable counties to generate low-cost maps and reports that help them prioritize their work by showing how roadway conditions will look under different construction scenarios for decades to come.
Continue reading Low-Cost Pavement Condition Forecasting Software Eases Local Road Planning
Crossroads 