The White House named Minnesota Department of Transportation State Traffic Engineer Sue Groth one of its 12 transportation “Champions of Change” for her role in implementing life-saving technology to help prevent collisions at rural intersections. The rural intersection conflict warning systems, which use sensors and lights to give motorists real-time warnings about traffic conditions, were developed by MnDOT’s Office of Traffic, Safety and Technology.
It’s worth noting that MnDOT Research Services and the University of Minnesota are also currently working on a project to develop a low-cost version of these systems using LEDs and solar panels. The ongoing research, being conducted by University of Minnesota— Duluth Professor Taek Kwon, is a continuation of the Advanced Light-Emitting Diode Warning System project completed in 2010.
ST. PAUL, Minn. – On Wednesday, May 8, 2013, the White House honored Sue Groth, Minnesota Department of Transportation’s state traffic engineer, as one of 12 people who are Transportation “Champions of Change.” The Champions event, “Transportation Technology Solutions for the 21st Century,” focused on individuals or organizations that have provided exemplary leadership in developing or implementing transportation technology solutions to enhance performance, reduce congestion, improve safety and facilitate communication across the transportation industry at the local, state or national level.
“These Champions represent the very best in American leadership, innovation and progress,” said Secretary Ray LaHood. “I’m proud to recognize these transportation leaders who work every day to grow our economy and help us reach our destinations more quickly, efficiently and safely.”
The MnDOT Office of Traffic, Safety and Technology has been selected as a Champion of Change for their work to reduce fatal and life-changing crashes on Minnesota roadways, while enhancing mobility for all users. OTST is being honored for designing, testing and helping to deploy dozens of life-saving rural intersection conflict warning systems throughout Minnesota, while leading a national effort to do more of the same throughout rural America. These systems save lives at rural intersections that might otherwise not warrant or afford more traditional traffic control devices or geometric improvements.
U of M transportation research highlights during 2012-2013 include a smartphone app for visually impaired pedestrians, pedestrian and bicyclist safety in roundabouts, methods for counting bike and pedestrian traffic on trails, and a filter that takes phosphorous out of storm water.
As is painfully evident this time of year, Minnesota’s weather is highly destructive to our asphalt roadways. One of the biggest challenges for transportation practitioners in cold-climate states like ours is low-temperature cracking in asphalt pavements. The distress caused by our extreme weather variations and constant freeze-thaw cycles wreaks havoc on our asphalt streets and highways, causing decreased ride quality, increased maintenance costs and shorter pavement lifespans.
On April 17, the Center for Transportation Studies presented its 2013 Research Partnership Award to the team members of a multi-state, Minnesota-led study designed to combat the problem. The project, “Investigation of Low Temperature Cracking in Asphalt Pavements, Phase II,” was a national pooled-fund study involving six state DOTs, four universities, the Minnesota Local Road Research Board and the Federal Highway Administration. It resulted in a new set of tools — test methods, material specifications and predictive models — that will be used to build longer-lasting pavements.
The project is a prime example of the value and benefits of cooperative research. Each organization brought its own unique strengths and expertise to bear on the problem. The University of Minnesota, led by Professor Mihai Marasteanu, brought its strength in lab testing of binders and mixtures, for example; other universities leveraged their respective expertise in data analysis, statistics and modeling capabilities. MnDOT, as the lead state agency, controlled the finances and kept the research on track, guiding the process through technical advisory panels. MnDOT’s materials laboratory and its unique MnROAD pavement research facility also played a key role in the study.
The above video provides an excellent overview of the project and includes commentary from key MnDOT and University of Minnesota team members. MnDOT is already moving to implement the results. It plans to use the new test procedure on several road construction projects this year. Iowa and Connecticut are among the other states reportedly planning implementation projects.
From left: University of Minnesota Professor Mihai Marasteanu, the project’s principal investigator; MnDOT State Aid Director Julie Skallman; MnROAD Operations Engineer Ben Worel; and CTS Associate Director for Development and Finance Dawn Spanhake, who presented the award. (Photo by Cadie Adhikary, Center for Transportation Studies)
Last night, KARE-11 News featured innovative pavement repair research sponsored by MnDOT. In a public-private partnership, Larry Zanko of the Natural Resources Research Institute at University of Minnesota Duluth connected with Krik Kjellberg’s company to microwave a mix of asphalt and magnetite in road holes, creating a long-lasting pothole fix.
In Minnesota, with our often wildly unpredictable weather and constant freeze-thaw cycles, potholes are a fact of life. Anyone who’s climbed into a motor vehicle in the last month or so has doubtlessly encountered countless reminders of this dismal reality. Fortunately, we have a small army of public works professionals devoted to eradicating this perennial nuisance. The Minnesota Local Road Research Board recently produced this video, which nicely explains the various methods used to combat potholes in Minnesota.
Potholes form when water invades cracks in the pavement and infiltrates the soil beneath it. When that water freezes, it stretches the road surface, causing the fractures to expand. After a few cycles of freezing and thawing, the pavement begins to buckle and eventually collapses under the weight of passing traffic, creating disruptions in the road’s surface.
Road crews use a variety of methods to fill potholes. The simplest method is the “throw-and-go” procedure, in which workers simply shovel an asphalt mixture into the pothole and pack it down until the road’s surface is smooth. A related method is “throw-and-roll,” where the patch is compacted using an asphalt roller.
Other methods include:
“semi-permanent” patching, in which workers clear the pothole of moisture and debris and then square the edges with a pavement saw before applying the patch;
“spray injection,” which involves using specialized equipment to blast water and debris out of the pothole before spray-filling it with asphalt mix and finally applying a dust coat of dry aggregate on top; and
“slurry” or “microsurfacing” crack filling, in which a slurry of aggregate, asphalt emulsion and mineral filler is placed over a crack in the pavement and leveled off using a squeegee.
This Asphalt Pavement Maintenance Field Guide (PDF), co-funded by MnDOT and produced by CTS, provides a handy how-to guide to pothole patching and other types of pavement repairs commonly applied by public works professionals in Minnesota.