Los Angeles Signal Priority System Should Be a Model for U.S. Transit Systems

Signal priority is a way to create faster, more regular bus service by adjusting length of stoplights for buses.

1 minute read

May 25, 2017, 10:00 AM PDT

By Casey Brazeal @northandclark


Metro Rapid Bus

By Tupungato / Shutterstock

The signal priority system reportedly used in Los Angeles County should be a model for cities that want to speed up their public transit around the country, argues Kyle Ryan writes in Active Transportation Alliance. "Seventeen years ago, when Los Angeles County decided to give its buses priority at traffic signals, the buses experienced huge gains in speed and reliability," Ryan writes. The system senses buses coming to a stoplight and can adjust the length of red and green lights.

Cities like Chicago could use this type of system, not only to speed up public transit commutes, but also to space out buses more evenly. "Buses are dispatched every 3-10 minutes and can be instructed to slow down or speed up to avoid bunching with other buses," Ryan argues. This system means less waiting time at bus stops and shorter commute time, making transit more equitable for those not moving in cars. 

Monday, May 22, 2017 in Active Transportation Alliance

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

Use Code 25for25 at checkout for 25% off an annual plan!

Interior of Place Versailles mall in Montreal, Canada.

Montreal Mall to Become 6,000 Housing Units

Place Versailles will be transformed into a mixed-use complex over the next 25 years.

May 22, 2025 - CBC

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.

June 4, 2025 - Diana Ionescu

White and yellow DART light rail train in Dallas, Texas with brick building in background.

DARTSpace Platform Streamlines Dallas TOD Application Process

The Dallas transit agency hopes a shorter permitting timeline will boost transit-oriented development around rail stations.

May 28, 2025 - Mass Transit

Line of multi-colored big rig trucks drivign down highway with other traffic including a yellow school bus.

Study: 4% of Truckers Lack a Valid Commercial License

Over 56% of inspected trucks had other violations.

June 4 - FreightWaves

Pedestrian holding visual impairment cane pressing crosswalk button.

Chicago Judge Orders Thousands of Accessible Ped Signals

Only 3% of the city's crossing signals are currently accessible to blind pedestrians.

June 4 - DRA Legal

People on bike wearing helmets stopped at intersection waiting for passing cars in Philadelphia, Pennsylvania.

Philadelphia Swaps Car Lanes for Bikeways in Unanimous Vote

The project will transform one of the handful of streets responsible for 80% of the city’s major crashes.

June 4 - Philly Voice

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.