While commercially available self-driving vehicles may still be decades away, an increasing number of vehicles on the market offer advance driver assistance systems (ADAS). For example, ADAS features include adaptive cruise control, steering automation, and hands-free steering.Continue reading New Project: Tool to Estimate the Safety Impact of Vehicle Levels of Automation on Minnesota Roads
After road construction, the adjacent disturbed soil has a diminished capacity to sustain vegetation, overall soil health is compromised from soil disturbance and there is an increased risk for erosion.
Soil quality in these areas can be replenished by importing topsoil (the preferred choice) or using organic composts. If organic compost is not available, proprietary soil amendments provide a cost-effective alternative. But information regarding the effects, mix ratios and application techniques for these products is limited. Research is needed to better understand optimal organic compost ratios and how to integrate these amendments to improve soil quality.Continue reading New Project: Comparison of Compost and Proprietary Soil Amendments for Vegetation Establishment
When local roads are temporarily used as haul roads or as detour routes, MnDOT compensates local agencies. However, local agencies believe the compensation model is outdated and inadequate, especially for local roads not built for large volumes of heavy vehicles. The methodology also has not been updated to reflect that local agencies have invested more local property and sales tax revenue into their systems beyond the gas tax.Continue reading New Project: MnDOT Haul and Detour Routes – Impacts on Local Roads
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
Transportation is the number one emitter of greenhouse gas emissions in Minnesota and medium to heavy duty trucks contribute to about 40% of transportation carbon pollution.
While electric cars and buses are becoming more common, medium and heavy duty electric trucks are still in their infancy, and the nationwide infrastructure needs to support them still has to be determined.
In a new study, MnDOT will identify the electric charging infrastructure needed along Minnesota highway corridors to support clean freight transportation.Continue reading New Project: Identifying and Optimizing Electric Vehicle Corridor Charging Infrastructure for Medium- and Heavy-Duty Trucks
MnDOT’s Disadvantaged Business Enterprise (DBE) Program was established by the federal government to ensure women-owned and minority-owned businesses have the opportunity to participate in MnDOT contracts.
Several contracting barriers exist for DBEs, which may have been exacerbated by COVID-19, such as access to capital, a shortage of PPE materials and staffing shortfalls due to workplace risks and caregiving responsibilities.Continue reading New Project: Understanding How the Disparate Effects of COVID-19 are Affecting MnDOT’s Efforts at Equitable Contracting