Skip to Content
Streetsblog Los Angeles home
Log In
Streetsblog.net

Syncing Traffic Lights No Sure-Fire Way to Reduce Emissions

8:01 AM PDT on August 15, 2012

From a motorist's perspective, few things are more frustrating than sitting at a red light when the lights ahead are all green. That would help explain the popularity of traffic signal synchronization, neatly timing lights so that someone traveling the speed limit can expect to wait only every several cycles.

Many communities have seized on synchronization as a relatively inexpensive way to reduce congestion and emissions. In fact, it's one of the approved uses for Congestion Mitgation and Air Quality money from the federal government.

But it's not quite as simple as it seems, says Network blog Transport Nexus. Some research has shown traffic signal synchronization can actually increase emissions, by encouraging more driving:

Traffic engineering has long been full of promises on solving road congestion, with many solutions worse than the problem. When roads have been widened or new roads built, induced demand has been the result. If we make all of our signals “smart” and easy for people to drive in the city, what happens then? We’ll see a mode shift away from alternative transportation options as people discover that synchronized traffic signals make driving easier, thus increasing demand for driving.

Making driving easier brings all the negative externalities to the fore: increased auto emissions, gas consumption and pressure on land uses to accommodate cars. Thus, while traffic signal synchronization seems like a good idea, the unintended consequences are likely to make the existing traffic congestion status quo even worse.

Where I live in Northeast Ohio, traffic signals have never been coordinated (or thinned out as the population has shrunk), and the headache of driving in Cleveland is one of the major reasons I started biking. Too bad our metropolitan planning organization still spends the bulk of its CMAQ money on traffic signal synchronization and not on bike lanes.

Elsewhere on the Network today: Reinventing Parking explains why American parking policies are like vanilla ice cream, European parking policies are like dark chocolate, and Japanese regs are like a sushi bar. Cap'n Transit says that evicting everyday activity from the street -- like child's play -- has contributed to chaos on the sidewalks. And Cycling Solution says that bus lanes are now open to cyclists in Budapest.

Stay in touch

Sign up for our free newsletter

More from Streetsblog Los Angeles

Input Meetings Starting This Weekend for Ballona Creek “Finish the Creek” Extension Study

Learn more and give your ideas for extending the Ballona Creek bike/walk path upstream through Culver City and into Mid-City Los Angeles

September 21, 2023

Guest Opinion: Metro Should Treat Walk and Bike Projects with the Respect They Deserve

Prioritizing true first mile/last mile infrastructure isn’t somehow optional; it’s how your customers get to and from the transit stations.

September 21, 2023

Eyes on the Street: Slow Streets in South Pasadena

The city has a sampler platter of quick-build temporary traffic calming installations to experience for the rest of the year

September 20, 2023
See all posts