Traffic Signals

Traffic Lights

Pennsylvania Awards $36 Million for Traffic Signal Upgrades

The state’s Green Light-Go program helps communities improve road safety through signal improvements.

August 25, 2023 - Land Line

An almost empty intersection in downtown Seattle Washington. An arial shot off of the side of a building that shows the crisscrossing of roads, crosswalks, and bike lanes.

Seattle Transitions to No Right Turns on Red

Every new traffic light in the city will be required to install ‘No Turn on Red’ signs, a tactic shown to reduce collisions.

May 5, 2023 - The Urbanist

Blurred view from ground level of yellow center lines on asphalt street

How Design Guidelines Can Reduce Road Safety

Signs and markings designed for traffic control can make conditions less safe for pedestrians and other road users.

January 20, 2023 - Streetsblog USA

Red Light Camera

Dallas Feels Impacts of Red-Light Camera Ban

Last year’s state ban ended a 13-year red-light enforcement program in Dallas. City officials say that intersections throughout the city are less safe without the cameras.

March 9, 2020 - The Dallas Morning News


Bike-Friendly City in Indiana is Known for Plentiful Roundabouts

Indiana's fifth-largest city, of just under 100,000, residents has 120 roundabouts, more than any city in the U.S., and only 14 traffic lights. The average traffic fatality rate is 83 percent lower than the national average.

February 2, 2020 - Smart Cities Dive

Crosswalk Button

What Walk Buttons Do (and Don't Do)

Are pedestrian walk buttons effective, or do they only give us the illusion of control? It can vary.

September 10, 2019 - WAMU

Austin Pedestrians

On the Life-Saving Potential of Leading Pedestrian Intervals

Giving pedestrians a head start at crosswalks is a simple fix that could save lots of lives. New York City has already seen a significant reduction in fatalities and injuries.

January 31, 2018 - CityLab

Traffic Lights

Maryland Adopts Smart Signals to Keep Traffic Flowing

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

October 30, 2017 - The Washington Post


Behind Some of History's Most Powerful Urban Innovations

A series of pieces from Sidewalk Labs examines the history and context of vital urban "innovations." So far, elevators, sewers, and traffic signals have been covered.

September 14, 2017 - Sidewalk Talk

Red Light Camera

Ann Arbor's Futuristic Traffic Software

The networked sensors and signals in Ann Arbor give the city a coordinated way to respond to traffic.

March 13, 2017 - Wired

Traffic Lights

Crunching the Safety Data Reveals the Need to Improve Traffic Lights

After completing an eight-year study of traffic collisions, the Seattle Department of Transportation realized that one way to immediately improve traffic safety would be to improve signalization an key intersections.

November 15, 2016 - The Urbanist

Traffic Light

Slot-Based Design Could Eliminate Traffic Lights

An MIT study determined that traffic lights, and their inefficiencies, could be eliminated if all vehicles were equipped to regulate their speed and "batch" together as they approach intersections.

April 12, 2016 - Fast Co. Design

Stop Sign Intersection

On the Benefits of Traffic Signal Removal

Certain intersections stand to gain from losing their traffic lights. According to this study, cities can save money and improve safety by uninstalling signals in low-traffic zones.

May 7, 2015 - CityLab

The Inside Scoop on Portland's Street Signal System

A new installment of the BikePortland podcast reveals the technical considerations in the city’s signal system that contribute to bike and pedestrian safety.

June 9, 2014 - BikePortland

Reading Between the Crosswalk: On the Significance of Pedestrian Icons

Have you ever noticed that the image of little man (it's usually a man) in pedestrian traffic icons differs depending on which country you're in? Artist Maya Barkai has, and her new project seeks to explore what these guys say about their culture.

October 17, 2013 - The Wall Street Journal

Do Stop Signs Make Streets Safer?

When communities feel like street traffic is unsafe, they usually demand stop signs or traffic lights to be installed. But studies show that those devices may actually make streets less safe.

April 26, 2011 - Streetsblog

Tarmac 2.0

New solar road technology could both absorb solar energy for electricity and provide a changeable LED grid that could respond to traffic conditions.

August 31, 2009 -

Town Removes All Traffic Signals

Bohmte, Germany is following the lead of an EU program called "Shared Space", which recommends that cities remove traffic signals and find ways to encourage cars to share their space with pedestrians and bicyclists.

June 28, 2008 - ABC News

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