(@joe.gustafson)

Traffic and Safety

Effectiveness of Traffic Control Devices to Reduce Unsafe Crosswalk Encroachment

Right turn movements made on a steady red circular traffic signal are allowed in Minnesota except when specifically prohibited by signage. Allowing right turns on red (RTOR) significantly improves intersection efficiency and reduces traffic conflicts by preventing unnecessary cycling of the traffic signal to serve right turns. However, drivers making RTOR often encroach into pedestrian crosswalks in order to look left... more »

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(@joe.gustafson)

Traffic and Safety

Are modern headlight designs hazardous to pedestrian safety?

Vehicular headlight design continues to evolve with greater control over light dispersion patterns. Increasingly, newer vehicles feature forward lighting that projects strong illumination on the roadway surface but very weak illumination above a certain level (the cutoff). This sharpened distribution of light entails several known challenges including reduced light output towards traffic signs (roadside and overhead),... more »

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(@joe.gustafson)

Traffic and Safety

Design of Channelized Right Turns to Maximize Safety and Accessibility for Nonmotorized Users

Channelized right turns can provide significant benefits for intersection operation by allowing right turns to bypass the main intersection. Channelized right turns also have the potential to provide safety benefits for pedestrians and shared-use path cyclists by reducing multiple-threat risk and improving sight lines for both motorized and nonmotorized users on the approach to their point of potential conflict. In... more »

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(@kenjohnson)

Traffic and Safety

Pavement Marking/Colored Pavement Friction Differential and Product Durability

Pavement markings, by their nature, tend to be slippery since glass media is added to provide retroreflectivity. Pedestrians (including those with disabilities), motorcyclists, and bicyclists are impacted by slippery pavement markings. There are available pavement marking and colored pavement products that provide additional friction and that show promise from a durability standpoint. These products have been used... more »

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(@mlevin)

Policy and Planning

Cost/benefit analysis of future SPaT deployment

Due to rising fuel costs, consumers are increasingly aware of fuel efficiency (MPG) in the vehicles they purchase, which is reflected in increasing hybrid and electric vehicle sales. Fuel efficiency directly contributes to greenhouse gas emissions, and the transportation sector accounted for 29% of US emissions in 2018. Anticipating future signal phases creates significant opportunities for individual vehicles to optimize... more »

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(@nick.haltvick)

Bridge and Structures

Live load reactions at bridge piers

Bridges constructed in the 1950s and 1960s are at an age where rehabilitation is necessary to extend the useful service life. When additional dead load is added by the project or deterioration is observed, MnDOT requires pier caps be rated using the current design code; it should be noted that the live load used in previous design codes is different than current design codes. Analysis often results in low load ratings,... more »

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(@chris.dedene)

Materials and Construction

Bituminous Underseal on Local Roadways

The City of Minneapolis is constructing a test section of a bituminous underseal in 2019. The section is broken into three 660-foot segments. The goal of this research is to monitor the performance of the test sections and determine the benefit, if any, gained from the application of the bituminous underseal. The appeal of a bituminous underseal is it combines a chip seal with a mill-and-overlay. Both techniques are... more »

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(@tfisher)

Policy and Planning

Community Transit Strategies

A human-centered design approach to transportation in Greater Minnesota can lead to more efficient transit solutions that utilize the existing public and private assets in rural communities. This approach can take several directions, depending upon the community's needs and assets. We propose engaging the city of Wabasha in a community transit pilot project that would give people with transportation needs access to rides... more »

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(@maria)

Traffic and Safety

Roundabouts: Are design practices ADA compliant?

The Minnesota Council on Disability (MCD) has raised concerns about the safety of methods currently employed for crossing at Minnesota Roundabouts for pedestrians with disabilities. Representatives of the Council recently approached MnDOT to bring awareness and discuss some concerns about current design practices. Because roundabouts offer so many beneficial features to a Minnesota community, it is important that they... more »

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(@maria)

Traffic and Safety

Pedestrian Features on Roundabouts

The accommodation of safe pedestrian movement at roundabouts needs to be studied with respect to a broad range of surrounding pedestrian facility types, contexts, and pedestrian crossing control features. Examples of pedestrian crossing control to be studied include: warning devices such as Rapid Rectangular Flashing Beacon(RRFB), crosswalk configurations and locations with respect to roundabout geometry, and other pedestrian... more »

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(@maria)

Materials and Construction

Increased Value street and utility reconstruction projects provide to a typical residential neighborhood

Street and utility reconstruction projects provide increased value to surrounding land use. It is often difficult for property owners to understand street improvement assessments relative to the increased value. Training/education tools are needed to communicate the broad range of benefits provided on a typical street reconstruction through a residential neighborhood. State Aid Pre-Screening Meeting input: A broader... more »

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(@maria)

Materials and Construction

Asphalt vs Concrete ‐ performance curves

The performance of concrete and bituminous pavement needs to be better understood and compared. Performance curves are need to compare roadway lifecycle attributes including pavement deteriorization.

 

State Aid Pre-Screening Meeting input:

Bituminous pavement deterioration curves and comparing to concrete pavement roads

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(@maria)

Maintenance Operations

Performance of Overlays

The performance of overlays differs by location in the State of Minnesota. Pavement failures, including potholes, occur in a broad range of service life, from 10 to 20 years. Research is needed to better understand the broad range of overlay performance including contribution factors such as mix design. State Aid Pre-Screening Meeting input: Performance of overlays differs by location. In some instances, overlays... more »

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(@deancurrent)

Environment

Creating snow fence demonstrations with the UMN

Recent research as part of ongoing research between MnDOT and the University of Minnesota has highlighted the need for 1) demonstrations of blowing and drifting snow and blow ice snow fence control measures to show potential landowner-adopters of snow fences how they work and 2) how they affect agricultural operations and specifically how can interruptions in agricultural operations be minimized by snow fence designs... more »

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(@maria)

Maintenance Operations

Notifying the public of county road and city street closures in common smart phone map apps

Most counties and cities are not well set up to distribute information about highway segments that are under construction or closed with a designated detour route. Carver County created their own Construction & Closures map online application, however most counties and cities don't have the staff or resources to generate the type of GIS database/mapping to support this application. In addition, this information ideally... more »

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