Aging pavement infrastructure and the deterioration of pavement surfaces over time remain an ongoing challenge in meeting roadway user expectations. Preventive pavement preservation treatments that are applied on sound, structured-condition pavements can extend the pavements’ functional service life and reduce future maintenance costs. Fog seals are one of these treatments. Fog seals are applied by spraying a thin layer of emulsion onto the pavement to slow or in some cases reverse the damage caused by oxidative aging. Asphalt emulsions are the most common material used in fog seals. Rejuvenators are usually added to the formulation to lower its viscosity and possibly even rejuvenate the surface of the existing aged pavement.
Continue reading Bio-Material Maintenance TreatmentsCategory Archives: research
General research posts.
Cybersecurity for Automated Vehicles
Article reprinted from the Center for Transporation Studies, July 2023
Continue reading Cybersecurity for Automated Vehicles
Sensor and Drone Technologies Help Maintain Minnesota’s Aging Bridge Infrastructure
Reprinted from Catalyst, September 9, 2023
As bridge infrastructure in Minnesota and across the country ages, maintaining and preserving the existing bridge network becomes increasingly important—and increasingly challenging. In Minnesota alone, 25 percent of bridge-deck area is more than 50 years old, and the number of bridges rated in “fair” condition has recently overtaken the number rated in “good” condition.
Continue reading Sensor and Drone Technologies Help Maintain Minnesota’s Aging Bridge Infrastructure
Effect of Low and Moderate Recycled Concrete Aggregate Replacement Levels on Concrete Properties
As the demand for aggregate in construction increases, recycling concrete waste as aggregate has been recognized as an environmentally sustainable solution with potential cost savings. It would allow recycling of construction and demolition waste and reduce some of the need to quarry and haul virgin aggregate. However, the use of recycled concrete aggregate (RCA) has been limited by concerns over its quality and performance, and by lack of uniform specifications as to what kind and how much of the aggregate to use in pavement construction. Studies and on-the-ground experience have shown that high levels of RCA reduce the durability of pavements. The effects of lower replacement levels have not been well documented, however.
Continue reading Effect of Low and Moderate Recycled Concrete Aggregate Replacement Levels on Concrete Properties
Connecting smart vehicles with traffic signals could reduce fuel use
Originally published in Catalyst, July 18, 2022.
Green means go and yellow means go faster—so goes a wry take on driver behavior at traffic signals. But it’s not just travel time that increases when you brake for a red: Fuel consumption does, too. Could transmitting signal data to connected vehicles (CVs) reduce stop-and-go cycles and fuel use? U of M researchers say yes.
Continue reading Connecting smart vehicles with traffic signals could reduce fuel use
Researchers Identify Freight Data Sources, Create Guidance to Aid Infrastructure Planning
The goods that continuously move through Minnesota by road, rail, air, water, and pipelines drive the state’s economy, making efficient freight transit—and excellent freight infrastructure—a high priority for the Minnesota Department of Transportation (MnDOT).
Continue reading Researchers Identify Freight Data Sources, Create Guidance to Aid Infrastructure PlanningPreparing for the Future of CAVs: Cybersecurity, Winter Weather Research
Connected and automated vehicles (CAVs) hold promise for improving transportation operations—but could also provide pathways for “malicious actors” to compromise vehicle security, said Rafael Stern, a U of M assistant professor, in a recent CTS webinar.
Continue reading Preparing for the Future of CAVs: Cybersecurity, Winter Weather Research
Strategies improve pollinator roadside habitat, reduce costs
First published in Catalyst, May 22, 2023.
Transportation agencies revegetate roadsides after construction projects to provide road stability, stormwater filtration, and visual appeal. Revegetation is also a good opportunity to create pollinator-friendly habitat. However, planting and maintaining ditches can be expensive, funds for such projects are usually limited, and there isn’t much data on which methods actually work.
Continue reading Strategies improve pollinator roadside habitat, reduce costs
Multimodal trip planner to make travel easier in Greater Minnesota, rural areas
Reprinted from Catalyst, May 9, 2023
When a person wants to take a trip across the country, they can choose from a variety of travel planning apps to help make that happen. But what if the trip they want to take is from Mankato to New Ulm, or within their own community, using non-personal transportation?
The Minnesota Department of Transportation has launched a pilot project to bring trip planning and payment technology for daily trips to areas less dense than urban settings.
Residents and visitors in southern and western Minnesota now have the ability to plan for and, in some cases, pay for public transit and intercity bus trips using the Transit app. Travel and route information for these agencies went live within Transit on March 1.
Transit, a free app available for download in Google Play or the Apple App Store, is used in more than 300 cities around the world. It allows users to see route and travel options for public transit and connecting services. Select agencies also have in-app ticketing, allowing riders to pay for fares electronically and then show their device to transit drivers to ride.
“This pilot with the Transit app focuses on rural areas because this technology has not yet been made available outside of Minnesota’s big cities,” says Elliott McFadden, MnDOT’s Greater Minnesota Shared Mobility Program coordinator. “The project will be the first to bring the latest technology to make it easier to plan and take trips in many communities in Greater Minnesota.”
The pilot will run through April 2024 and is funded by two innovation grants from the Federal Transit Administration at a cost of $1.9 million.
U of M researchers led by Alireza Khani will evaluate the project to help determine whether this technology should be scaled to the rest of the state. Focusing on southern Minnesota, the research team will work closely with MnDOT’s project management team and the platform development team to study these questions:
- How do residents of the region benefit from having access to a variety of mobility options through an integrated platform?
- To what extent does the platform help increase transit ridership and reduce personal vehicle use?
- How can the features of the platform—such as route planning or pricing—be optimized for greater system efficiency and benefits for all residents?
“Our goal is to provide the data and analysis policymakers need to make the most effective transit investments,” says Khani, an associate professor in the Department of Civil, Environmental, and Geo- Engineering.
(Adapted from a MnDOT press release, March 1, 2023.)
More Information
Monitoring Bumble Bee Populations in the Twin Cities Metro – Lessons Learned
In a project funded by MNDOT, entomologists developed an innovative method for surveying bumble bee populations alongside roadways. The researchers have recently published an article in Biological Conversations, Vol 283 focusing on the lessons learned about sampling when surveying these quick-moving bees.
Continue reading Monitoring Bumble Bee Populations in the Twin Cities Metro – Lessons Learned
Crossroads 