Changing This Law Could Reduce Traffic Deaths

In California and much of the rest of the country, says Andrew Said, the laws governing speed limits and enforcement are dangerously outdated, especially where pedestrians and cyclists are concerned. What could we change?

1 minute read

July 14, 2016, 7:00 AM PDT

By Philip Rojc @PhilipRojc


Speed Limit

Jon Bilous / Shutterstock

They aren't part of the built environment, but laws often dictate how safe places are to use. According to a piece by Andrew Said, California's speed limit laws are outdated, and unsafe streets are the result. 

For example, "In Los Angeles, police are unable to ticket speeding drivers for violating the posted speed limit on 75 percent of the city’s streets. Why not? It is because the speed surveys required by law for these streets have expired." 

Those speed surveys set limits based on the "prevailing speed." That is, how fast cars are travelling in the 85th percentile. "Once this speed of majority drivers is determined, the law only allows an additional 5 mph reduction to account for unforeseen safety conditions." And that's a truly auto-centric legal method. 

"In countries with the highest rates of bicycle ridership, the severity of injuries caused by crashes at a given speed is taken into account when establishing speed limits. This approach is known as Injury Minimization, or Safe Systems. The idea is to minimize the probability of death and serious injury." 

Said notes that in California, Injury Minimization already exists in mandated 25-mph school zones, which must conform to that limit regardless of prevailing speed. "What about designating a pedestrian zone? Or an active transportation zone? The same rationale of protecting vulnerable road users could apply."

Wednesday, June 15, 2016 in Streetsblog LA

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

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 11, 2025 - Diana Ionescu

Large crowd on street in San Francisco, California during Oktoberfest festival.

The Simple Legislative Tool Transforming Vacant Downtowns

In California, Michigan and Georgia, an easy win is bringing dollars — and delight — back to city centers.

June 2, 2025 - Robbie Silver

Rendering of Shirley Chisholm Village four-story housing development with person biking in front.

San Francisco's School District Spent $105M To Build Affordable Housing for Teachers — And That's Just the Beginning

SFUSD joins a growing list of school districts using their land holdings to address housing affordability challenges faced by their own employees.

June 8, 2025 - Fast Company

Bird's eye view of half-circle suburban street with large homes.

In More Metros Than You’d Think, Suburbs are Now More Expensive Than the City

If you're moving to the burbs to save on square footage, data shows you should think again.

30 minutes ago - Investopedia

Color-coded map of labor & delivery departments and losses in United States.

The States Losing Rural Delivery Rooms at an Alarming Pace

In some states, as few as 9% of rural hospitals still deliver babies. As a result, rising pre-term births, no adequate pre-term care and "harrowing" close calls are a growing reality.

June 15 - Maine Morning Star

Street scene in Kathmandu, Nepal with yellow minibuses and other traffic.

The Small South Asian Republic Going all in on EVs

Thanks to one simple policy change less than five years ago, 65% of new cars in this Himalayan country are now electric.

June 15 - Fast Company