Category Archives: Research

General research posts.

New signs give highway drivers more reasons to stop at rest areas

According to recent survey results, new highway signs promoting rest area amenities are influencing motorists’ decisions to use them.

A sign posted on a rest area door invites readers to take a quick survey about the rest area. The sign includes a phone number to text or call, a QR code and a survey keyword.

Among the 947 respondents using an electronic customer feedback system, 33 percent said they had seen the signs and 29 percent were not sure if they had. Of these two groups, 27 percent indicated the signs influenced their decision to stop and 61 percent described the signs as helpful.

These visitors had the opportunity to take a quick survey via QR code displayed on door decals, stand signs and flyers at the rest areas.

“No other states have installed advance rest area signage that list amenities available at upcoming rest areas,” said Rob Williams, MnDOT’s Safety Rest Area program manager. “We believe this is a cost-effective way to entice people off the road for breaks.”

MnDOT began a two-year pilot project in 2015 to implement findings from its 2009 Rest Area Amenities Study, which suggested that more detailed signage about rest area amenities could encourage motorists to pull off and take a break – which could save lives. According to the National Highway Traffic Safety Administration, drowsy driving-related crashes resulted in 795 deaths in 2017. Williams applied for research implementation funds to install 36 signs advertising the amenities ahead of 21 rest areas along Interstate 35 and I-94, as well as at the Brainerd Lakes Area Welcome Center.

Safety rest areas are one tool to keep drivers safe by giving them a place to stop, rest and refresh. MnDOT operates 51 Class I rest areas throughout the state, but not all rest areas offer the same amenities. Depending on the traveler, it may be a family restroom, fenced dog park, or children’s play area that best serves their needs.

MnDOT’s Rest Area Program is continuously working to improve rest areas to better serve travelers and reduce driver fatigue accidents.

“Our rest areas provide an opportunity to directly interface with Minnesotans and visitors traveling through our state, and we want to provide them with the best possible experience,” Williams said.

Ongoing enhancements to our rest areas include improving safety, accessibility and sustainability by:

  • Increasing visibility in rest area lobbies and installing video recording systems to improve visitor safety
  • Improving accessibility and introducing family restrooms
  • Increasing sustainability by use of native vegetation, installing electric vehicle charging stations, using materials with lower life-cycle costs and, in some cases, developing green roofs

The safety rest area program will seek funds to install additional advance signage as rest areas are remodeled. To learn more about the safety rest area signage project, visit the Office of Research & Innovation.

Implementing CIM in Preliminary Design of Infrastructure

Using an existing county road project as context, researchers examined the digital technologies and processes associated with civil integrated management (CIM). A comparison of CIM with the traditional methods used in the proposed county project demonstrated the advantages of CIM.

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Using Debonded Strands to Reduce End Stress in Bridge Beams

A new MnDOT-funded research study has found that most agencies in states with weather similar to Minnesota’s use debonded strands in prestressed concrete bridge beams. MnDOT may begin piloting debonding as an alternative to draping, which manufacturers claim is time-consuming, challenging to worker safety and expensive.

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Collaboration with Minnesota Zoo aims to conserve wildlife

Turtles and other wildlife are at risk along Minnesota roadways.

MnDOT is collaborating with the Minnesota Zoo on a new research project installing small animal exclusion fencing. The fencing is intended to redirect turtles (and other small animals) to culverts and bridges where they can cross the road safely.

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Low-Temperature Cracking Test Produces Repeatable, Reliable Results

Researchers ran a sophisticated low-temperature asphalt cracking performance test at multiple labs to study the test, its variability and repeatability, and its additional promise in studying reflective cracking susceptibility of overlays. Results put MnDOT closer to implementing test specifications for low-temperature cracking test for pavement mixes.

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Investigating Wastewater Reuse at Rest Areas and Truck Stations

Researchers have provided MnDOT with a comprehensive and practical evaluation of what the agency would need to do to develop wastewater reuse systems for its truck stations and rest areas. Two sites will install the research project’s recommended systems soon. 

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Smartphone App Alerts Drivers Exceeding Speed Limits on Curves

Researchers have developed a proof-of-concept curve speed warning system for use with mobile phones, a technology they hope car manufacturers might adopt for in-vehicle systems. The proof-of-concept system uses data from local road agencies on curve locations, speed limits and signage with geofencing to trigger cloud-based data alerts to road users driving faster than recommended speeds for curves.

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Using Regional Materials to Manage Stormwater Runoff

Researchers determined that natural soil amended with locally sourced materials performed well in bioslopes and bioswales. This practice will allow MnDOT to avoid hauling in costly commercial materials for stormwater management installations.

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Evaluating Iron-Enhanced Swale Ditch Checks for Phosphorus Removal

Researchers documented performance of an iron-enhanced ditch check filter to remove phosphorus from stormwater over three years. The filter was effective, but its performance decreased over time, and it will require relatively frequent maintenance. Several design changes may be considered.

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