Beyond the border: Canadian studies consider permeable pavement, climate change impacts on deicing operations

Reprinted from MnLTAP News, November 17, 2025

The 2025 Salt Symposium highlighted two studies from Canada, one comparing salt applications on permeable and asphalt surfaces and another considering the impact of climate change on municipal operations. Hosted by Bolton & Menk, the August 5 Salt Symposium brought together professionals from throughout the world to share research, projects, and approaches for chloride management.

Continue reading Beyond the border: Canadian studies consider permeable pavement, climate change impacts on deicing operations

Beyond traffic: Transportation as a social construct

Reprinted from CTS News, September 8, 2025

Urban transportation is more than roads and bridges: it’s a powerful social force that shapes our lives and influences our opportunities, well-being, and even power dynamics. Consider the everyday experience of commuting to work—the route you take, the cost of the ride, and the people you encounter are all shaped by social forces. By looking at transportation through this social lens, University of Minnesota researchers are moving beyond physical infrastructure to understand its deeper impact on society.

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CTS Webinar: Innovations for Energy-Efficient Transportation

About the Event

Transportation is one of the largest sources of greenhouse gas emissions in the U.S., and reducing those emissions is key to tackling the climate crisis. New technologies—from eco-friendly navigation apps to connected and automated vehicles—offer exciting opportunities to make our transportation system cleaner and more energy efficient. But these tools can also create unexpected challenges, such as increased traffic congestion or higher overall emissions, if not carefully designed.

In this webinar, researchers will share new approaches to smarter routing and vehicle technology that can lower energy use and reduce emissions. Join us to learn how innovations in navigation, automation, and vehicle control could help shape a more sustainable future.

Speakers

Zongxuan Sun is a professor in the Department of Mechanical Engineering at the University of Minnesota. He is an expert on dynamic systems and control with applications in automotive propulsion systems. He worked at the General Motors Research Center for seven years prior to joining the University in 2007. His research work includes system modeling, control theory, building unique instruments, and testbeds for experiments.

Michael Levin is an associate professor in the Department of Civil, Environmental, and Geo- Engineering at the University of Minnesota and a CTS scholar. His research focuses on modeling connected and automated vehicles and intelligent transportation systems to predict and optimize how these technologies will affect travel demand and traffic flow. Levin is specifically interested in using traffic flow, transportation network analysis, and operations research methods to study these new technologies and their effects on cities.

Registration

This webinar is free, but registration is required. Once you have registered, you will receive an email confirmation with a Zoom link. The link should not be shared with others; it is unique to you.

Please let us know how we can ensure that this webinar is inclusive to you. What accommodations or access needs can we help facilitate? Contact Samantha Hahn-Douville at snhahn@umn.edu when you register to help us provide you with the best access.

If you’re unable to join us for the live broadcast, a recording will be available here after the event.

For more information, go to the CTS website.

Related MnDOT Research

Bike infrastructure planning based on mobile-sourced data and anticipated route shifts (Active)

Impacts of Shared Mobility on Infrastructure usage, Greenhouse Gas Emissions, and Accessibility (Active)

Quantifying the Influence of Driver Behavior on Greenhouse Gas Emissions and Air Quality (Active)

Cost/Benefit Analysis of Fuel-Efficient Speed Control Using Signal Phasing and Timing (SPaT) Data: Evaluation for Future Connected Corridor Deployment (2023)

Mitigating the Negative Effects of Spaghetti Junctions

Complex highway interchanges in large metropolitan areas, also referred to as spaghetti junctions, have contributed greatly to enhancing vehicular connectivity and spurring economic growth. But the benefits of this built infrastructure are not evenly distributed, and neighborhoods near these highways are often negatively impacted. This project explored strategies used by other states to mitigate the consequences of spaghetti junctions that MnDOT could implement to improve conditions and livability for similar neighborhoods in Minnesota.

Continue reading Mitigating the Negative Effects of Spaghetti Junctions

Evaluating Taconite as a Lower Cost Friction Treatment

High friction surface treatments (HFSTs) on Minnesota roads are composed of imported, industry standard calcined bauxite aggregate. This material is expensive, and producing it is energy-intensive. Taconite aggregate, a by-product of the Minnesota mining industry, is a potential alternative to calcined bauxite that is less expensive. This research compared taconite and calcined bauxite in field skid resistance performance testing to determine the feasibility of using taconite in place of calcined bauxite in HFST applications.

Continue reading Evaluating Taconite as a Lower Cost Friction Treatment

CTS Webinar: Innovations for Energy-Efficient Transportation

Thursday, November 13, 2025, 12:00–1:30 pm Virtual

About the Event

Transportation is one of the largest sources of greenhouse gas emissions in the U.S., and reducing those emissions is key to tackling the climate crisis. New technologies—from eco-friendly navigation apps to connected and automated vehicles—offer exciting opportunities to make our transportation system cleaner and more energy efficient. But these tools can also create unexpected challenges, such as increased traffic congestion or higher overall emissions, if not carefully designed.

In this webinar, researchers will share new approaches to smarter routing and vehicle technology that can lower energy use and reduce emissions. Join us to learn how innovations in navigation, automation, and vehicle control could help shape a more sustainable future.

Speakers

Zongxuan Sun is a professor in the Department of Mechanical Engineering at the University of Minnesota. He is an expert on dynamic systems and control with applications in automotive propulsion systems. He worked at the General Motors Research Center for seven years prior to joining the University in 2007. His research work includes system modeling, control theory, building unique instruments, and testbeds for experiments.

Michael Levin is an associate professor in the Department of Civil, Environmental, and Geo- Engineering at the University of Minnesota and a CTS scholar. His research focuses on modeling connected and automated vehicles and intelligent transportation systems to predict and optimize how these technologies will affect travel demand and traffic flow. Levin is specifically interested in using traffic flow, transportation network analysis, and operations research methods to study these new technologies and their effects on cities.

Registration

This webinar is free, but registration is required. Once you have registered, you will receive an email confirmation with a Zoom link. The link should not be shared with others; it is unique to you.

Credit

Attendees are eligible for Professional Development Hours (PDHs) and American Institute of Certified Planners (AICP) certification maintenance credits.

More information

For more information or to request support, go to complete announcement on the Center for Transportation Studies website.

Related MnDOT Research Projects

Evaluating Road Designs That Use Lower Quality Aggregate

Aggregate materials used in the base and subbase layers of pavements provide structural support and drainability to Minnesota roads. But the supply of locally available high-quality aggregate material is becoming increasingly scarce. This project explored sustainable and cost-effective solutions for constructing durable flexible pavement roads with lower quality aggregate material.

Continue reading Evaluating Road Designs That Use Lower Quality Aggregate

Minnesotans geared up for e-bike rebates. Now data reveals more about them

Republished from CTS News (Catalyst) for October 14, 2025

More than 14,600 Minnesota residents applied for a rebate through the state’s e-bike rebate program when it launched in 2024. Established by the Minnesota Legislature to help reduce the cost of buying a new e-bike, the program was so popular that within minutes of opening in June 2024, the number of applicants overwhelmed the system and crashed the website. The state was forced to fix the technology challenges and reopen the application about a month later.

The scenario drove researchers at the University of Minnesota to dig deeper into the data about who applied for the rebate in the first year. Their project aims to shed light on who benefitted from the program, get feedback on the application process, and learn more about rebate use.

E-bikes, which operate like a bicycle but have an electric battery and motor for pedaling assistance, have increased in popularity in recent years, and supporters are promoting their potential as a sustainable transportation option. The state legislature allocated $2 million in both 2024 and 2025 for the rebate program.

“Minnesotans seem to have an appetite to get an e-bike, whether that’s because of the state’s incentive or for other reasons—including that Minnesota has some of the best bike infrastructure around,” says Kaitlyn Denten, a researcher with the Humphrey School’s Institute for Urban and Regional Infrastructure Finance (IURIF) and project co-lead.

For the first part of this project, researchers analyzed rebate applicant data, which included demographic information, income level, tax filing status, and ZIP code but no personal identifiers. Data also included a person’s rebate application status, the rebate amount, and whether the applicant used the rebate to purchase a new e-bike.

In the program’s first year, the maximum rebate was $1,500; individual amounts depended on an applicant’s income level and tax filing status. People who applied for and received a rebate certificate could purchase their e-bike and eligible bike accessories from a participating retailer. Of the total applicants, 1,519 people received a rebate and 1,327 used one to purchase an e-bike. According to the data, half of the rebates went to households earning less than $75,000 a year.

The Twin Cities seven-county metro area had strong representation, with 66 percent of applicants, 67 percent of recipients, and 66 percent of rebate users coming from the metro area. The average age of applicants was 49 years old.

For the project’s second part, researchers used an online survey to collect feedback on the application process and information about how people who received a rebate were using their e-bike, among other data. The survey, which was available between March 17, 2025, and April 5, 2025, received nearly 4,500 responses.  

Of the survey respondents, 3,920 individuals applied for a rebate, 496 received a rebate, and 455 used the rebate to purchase an e-bike. For those who received a rebate but didn’t use it, among the reasons cited were that the rebate didn’t cover enough of the e-bike’s cost and the rebate certificate expired before they were able to use it. 

One surprising finding: Some people bought an e-bike even if they didn’t receive a rebate, says CTS scholar Camila Fonseca-Sarmiento, IURIF director of fiscal research and project co-lead. “Or, if a couple received a rebate, they ended up buying two e-bikes. This could be spurring the use of e-bikes instead of personal vehicles.”

Many survey respondents expressed frustration with the initial application process, referring to the technical glitches, long wait times, and unclear instructions. Several respondents did note, however, that the second application round ran more smoothly.

Some respondents also raised concerns about the fairness of the program’s rollout, pointing to barriers faced by people with limited internet access and electronic devices, people with disabilities, and people with inflexible work schedules (the application period opened on a weekday).

Future research should focus on the effects of 2025 program changes, including income eligibility, application processes, and rebate amount, the researchers say. In addition, researchers noted that a statewide travel study could help assess how rebates might influence a shift from personal vehicle use to an e-bike, a question left unanswered because of limited e-bike use among current rebate recipients.

This research project was sponsored by the Applied Research in Transportation (ART) Program, which addresses time-sensitive research questions in a 6 to 12 month timeframe. CTS and the Minnesota Department of Transportation contributed initial funding to launch this pilot program in 2024, with the Metropolitan Council joining in 2025. To reinforce the applied nature of the program, ART projects must directly address a current process, document, or policy need with an initial focus on sustainability in transportation and climate change impacts.

—Peter Raeker, contributing writer  

Related Research from MnDOT

Operational Characteristics of Conventional and Electric-Assisted Bicycles and Their Riders (ongoing)

Assessing the Economic Impact and Health Benefits of Bicycling in Minnesota

Human behavior insights are driving transportation safety forward

Reprinted from CTS News Catalyst, September 11, 2025

To better understand how roadway crashes can be prevented, it’s essential to explore the human behaviors that contribute to them. This objective is core to the work of the U of M’s Human Factors Safety Laboratory (HFSL). Research Associate Professor and CTS scholar Nichole Morris, who directs the lab, outlined its mission and impact in a recent Toward Zero Deaths (TZD) webinar highlighting Minnesota’s traffic safety research ecosystem. 

Minnesota TZD is the state’s cornerstone traffic safety program, employing an interdisciplinary approach to reducing traffic crashes, injuries, and deaths on the state’s roads. CTS partners with TZD to provide program administration, event coordination, and communications.

The HFSL brings together behavioral scientists and engineers dedicated to reducing roadway and occupational injuries and fatalities. They combine research on human behavior with the design and testing of user-centered systems to create solutions that work better for everyone.

“Human factors is the intersection between people and systems,” Morris explained. From in-vehicle technologies and roadway signage to partnerships with larger organizations such as law enforcement, transportation systems involve a wide range of human-system interactions.

Four research tracks shape the lab’s work:

  • Crash reporting. Although projects often intersect, crash reporting is foundational to the other research tracks. Morris refers to it as the lifeblood of transportation safety—without crash data, researchers don’t know what’s working and what isn’t. In one of its more consequential projects, the HFSL helped rebuild the front end of MNCrash—an application designed for law enforcement to document and report crashes. In close collaboration with the Minnesota Departments of Transportation and Public Safety as well as multiple law enforcement agencies, the HFSL team helped to streamline the user experience and improve data completeness and accuracy. Since deploying the updated version in 2016, MNCrash has been adopted by all law enforcement agencies across Minnesota. It’s featured in the sixth edition of the USDOT’s Model Minimum Uniform Crash Criteria and has become the national standard for crash reporting.
  • Maintenance and work-zone safety. In one project, leveraging the expertise and methods gained from MNCrash, the lab collaborated with MnDOT and maintenance workers on a streamlined app to make documenting work-zone intrusions easier. After its launch in 2022, the team continued work, using low-cost sensors and radar to help reduce select work-zone driving speeds in real time.
  • Pedestrian and non-motorist safety. The Stop for Me campaign, a collaboration with MnDOT, St. Paul, Ramsey County, and Western Michigan University, has been adopted in communities across Minnesota. The campaign—which combines enforcement and engineering treatments to improve yielding at crosswalks—has inspired similar efforts in more cities around the country. Other projects include studies on dedicated right-turn lanes and temporary and permanent pedestrian infrastructure to reduce conflicts between drivers and pedestrians.
  • Infrastructure and signage. The lab’s work on J-turns, which have proven effective at reducing fatal crashes, has helped to identify and address several navigational errors drivers may make when first encountering this type of intersection. The researchers have found that poor or confusing first experiences with J-turns can lead to negative community perceptions and result in pushback on J-turn implementation. The research has found specific pavement markings to help guide drivers and facilitate successful use of J-turns—leading to fewer crashes and better driver experiences.

Morris emphasized that investment in sound research methods and collaborations across partner institutions, organizations, and communities is what creates successful research outcomes. While studies may yield results in the moment, she says investing in methodology is what really carries the work forward. The HSFL’s work continues to inspire other states and agencies, Morris added.

—Krysta Rzeszutek, CTS digital editor

Related research from Nichole Morris

Developing Biochar Specifications for Stormwater Management 

Effective stormwater management helps keep roadway contaminants from entering Minnesota’s lakes and streams. Management practices include soil and vegetation in roadside bioretention systems that filter heavy metals and hydrocarbons created by vehicles. Based on other studies, retention and transformation of roadside pollutants should be improved by biochar application to existing or engineered soils. Abundant sources of biomass can be used to produce biochar, a soil amendment with numerous benefits. MnDOT and local agencies identified biochar specifications for effective use in stormwater treatment to support the next phase of testing and development of biochar design guidance. 

Continue reading Developing Biochar Specifications for Stormwater Management 

Minnesota's transportation research blog