Traffic Signals
Austin Left Turn Improvements Cut Serious Crashes by Half
Changes to left turn infrastructure and signal timing led to a 47 to 72 percent drop in fatal and serious injury crashes.
Boston AI Pilot Optimizes Traffic Light Timing
The program has led to reductions in stop-and-go traffic of as much as 50 percent.
Traffic Tech is Helping Texas Curb Road Deaths
The state is deploying AI-assisted technology to identify dangerous road segments and improve signal timing.
Pennsylvania Awards $36 Million for Traffic Signal Upgrades
The state’s Green Light-Go program helps communities improve road safety through signal improvements.
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.
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.
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.
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.
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.
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.
Maryland Adopts Smart Signals to Keep Traffic Flowing
The new signals will respond to congestion in real time throughout the day.
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.
Ann Arbor's Futuristic Traffic Software
The networked sensors and signals in Ann Arbor give the city a coordinated way to respond to traffic.
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.
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.
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.
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.
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.
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.
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.
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.
Placer County
Skagit Transit
Berkeley County
Chaddick Institute at DePaul University
HUDs Office of Policy Development and Research
HUDs Office of Policy Development and Research
NYU Wagner Graduate School of Public Service
City of Cambridge, Maryland
