Skip to Content
Streetsblog Los Angeles home
Streetsblog Los Angeles home
Log In
Streetsblog CA

DamienTalks 40 – Michael Manville on Automatic Road Widenings

It's been a while since we recorded a #DamienTalks specifically for the California website, but now we're back with a good one. In this week's edition, Damien Talks with Michael Manville, a professor and researcher at UCLA.

#DamienTalks
false

Manville has hit a bit of Livable Streets fame with an article he wrote for the Journal of Transportation and Land Use. In that article, he outlines why laws requiring developers to invest in road widening to "mitigate" traffic created by their development don't actually do anything to improve traffic flow locally or regionally.

Almost nobody who understands transportation planning believes that these requirements do anything to improve traffic flow--yet these laws persist.

Manville doesn't only debunk the theory behind the laws, but also offers a solution...should policy makers heed his call.

You can read "Automatic street widening: Evidence from a highway dedication law" at the Journal of Transportation and Land Use here, and a summary of the article from Streetsblog USA here.

We’re always looking for sponsors, show ideas, and feedback. You can contact me at damien@streetsblog.org, at twitter @damientypes, online at Streetsblog California or on Facebook at StreetsblogCA.

Stay in touch

Sign up for our free newsletter

More from Streetsblog Los Angeles

L.A. Union Station Run-Through Tracks Complicated By Vernon Challenge

Much needed improvements now face potential cost increases and delays over a planned relocation of a short stretch of private rail storage tracks

October 17, 2025

Metro To Open D Line Subway Extension By March 2026

The 4-mile Metro D Line Extension Section 1 will extend from Wilshire/Western in Koreatown to La Cienega/Wilshire in Beverly Hills

October 15, 2025

Huntington and Fremont to get Complete Street Redesigns in South Pasadena

Early concepts portray lush, green streets - with pedestrian, bike, and bus facilities.

October 14, 2025
See all posts