News

Highway maintenance activities performed in and around fast-moving traffic can be high-risk and even deadly.

To explore available technologies that may be used to automate the work and reduce the risks maintenance crews face working alongside vehicles every day, the California Department of Transportation (Caltrans) investigated the current state of national research, identifying knowledge gaps and potential next steps for further study.

Read the report: Automated Connected Technologies (ACT) and Remote Virtual Inspection (RVI) for Work Zones, March 2025.

Image source: Caltrans

Seeds that are native to a local environment tend to be more resilient and require less maintenance than other seed varieties when used in roadside rights of way. Once established, native plantings can also help to reduce erosion and provide pollinator habitats.  

To update its recommended practices for seeding the state’s roadside areas, the Illinois Department of Transportation evaluated a variety of seed mixes for more than a year after planting, and surveyed other Midwestern states’ best practices for selecting and managing vegetation in roadside areas.

Read the final report: Illinois Department of Transportation’s Seeding Standards and Best Management Practices, May 2025.

Image source: Illinois Department of Transportation

The surface friction of an asphalt pavement is critical for ensuring adequate skid resistance and driver safety.

As virgin aggregates are costly and limited, recycled asphalt is often used as a base course in pavement construction. However, because the frictional properties of these recycled aggregates are unknown, it’s rarely used as a surface material.

To quickly assess the frictional properties of new and recycled aggregates and determine whether recycled aggregates could be used in cost-effective surface treatments, the Tennessee Department of Transportation conducted laboratory and field skid resistance measurement tests to identify practical devices and procedures for determining aggregate friction properties.

Read the report: Investigating the Long-term Frictional Properties and Establishing Aggregate Polishness Guidelines for Asphalt Surface Mixtures in Tennessee, April 2025.

Image source: Tennessee Department of Transportation

Truck-mounted attenuators (TMAs) are designed to protect workers in highway work zones by absorbing crashes, but drivers of these vehicles often face the most safety hazards.  

To improve safety for all workers, the Minnesota Department of Transportation initiated a research study to determine whether driverless TMAs could be a viable option for its fleet.

Read the project summary: Automated Truck Mounted Attenuators (ATMA), March 2025.

Image source: Minnesota Department of Transportation

In honor of National Work Zone Awareness Week, which takes place this week from April 21-25, we’ve rounded up a few of the innovative solutions that No Boundaries member states have recently shared to make working in and around traffic less hazardous for their highway maintenance crews.

• Automated Flagger Assistance Device. Missouri DOT field tested this device on a two-lane work zone and found that drivers behaved better than with a traditional flagger. Learn more.
• Night Light Safety Lighted Vests. Connecticut DOT’s maintenance workers wear rechargeable lighted vests when working in and around traffic at night to improve their visibility. Learn more.
• RAPTOR Temporary Rumble Strip Placer. Maryland DOT uses portable rumble strips to remind drivers to slow down in and around work zones. The RAPTOR vehicle attachment allows rumble strips to be placed and retrieved quickly and easily. Learn more.

Share your agency’s innovative products and ideas and explore others’ solutions on No Boundaries’ searchable Innovations Database.