Maryland Adopts Smart Signals to Keep Traffic Flowing

The new signals will respond to congestion in real time throughout the day.

1 minute read

October 30, 2017, 10:00 AM PDT

By Elana Eden


Traffic Lights

Horia Varlan / flickr

Hoping to cut drive times by up to 13 percent, Maryland will spend $50 million to install smart traffic signals statewide.

Currently, if congestion occurs, "the state's 2,500 signals require a technician to go out and reprogram their timing, leaving them unable to adjust quickly to keep traffic moving," explains Katherine Shaver in The Washington Post. The new signals will use pavement sensors to detect even minor backups, and adapt by re-timing light changes.

Maryland isn't the first state to use smart signals, but its network may become the country's most extensive. The rollout will begin this month, starting in corridors with the most compatible technologies.

Wednesday, October 25, 2017 in The Washington Post

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Cover CM Credits, Earn Certificates, Push Your Career Forward

Aerial view of town of Wailuku in Maui, Hawaii with mountains in background against cloudy sunset sky.

Maui's Vacation Rental Debate Turns Ugly

Verbal attacks, misinformation campaigns and fistfights plague a high-stakes debate to convert thousands of vacation rentals into long-term housing.

July 1, 2025 - Honolulu Civil Beat

Logo for Planetizen Federal Action Tracker with black and white image of U.S. Capitol with water ripple overlay.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

July 2, 2025 - Diana Ionescu

White and purple sign for Slow Street in San Francisco, California with people crossing crosswalk.

San Francisco Suspends Traffic Calming Amidst Record Deaths

Citing “a challenging fiscal landscape,” the city will cease the program on the heels of 42 traffic deaths, including 24 pedestrians.

July 1, 2025 - KQED

Google street view of wide street in Cleveland, Ohio with blue 55th Street sign and red brick three-story building visible in right corner.

Cleveland to Boost Bike Safety With New Bike Lanes, School Programs

The program, using curriculum created by Cleveland Bikes, is part of a broader effort to improve safety along school routes.

5 seconds ago - Signal Cleveland

Aerial view of heavily damaged mobile homes after a hurricane in Florida.

Florida Home Insurers Disproportionately Dropping Low-Income Households

Non-renewal rates are highest in inland counties, not the coastal areas most immediately vulnerable to storms.

1 hour ago - Inside Climate News

"Altadena - Not For Sale" yard sign in front of burned down house after Eaton Fire in Altadena, California in January 2025.

Half of Post-Fire Altadena Home Sales Were to Corporations

Large investors are quietly buying up dozens of properties in Altadena, California, where a devastating wildfire destroyed more than 6,000 homes in January.

July 7 - Dwell

Urban Design for Planners 1: Software Tools

This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.

Planning for Universal Design

Learn the tools for implementing Universal Design in planning regulations.

Associate/Senior Planner

Gallatin County Department of Planning & Community Development

Senior Planner

Heyer Gruel & Associates PA