More Is Less on L.A.’s I-405, Michael Manville Says

Associate Professor of Urban Planning Michael Manville is quoted in a StreetsBlog USA article on worsening traffic congestion in and around Los Angeles, especially in the Sepulveda Pass. The completion of the I-405 Sepulveda Pass Improvement Project in 2015 was projected to alleviate congestion, but studies have shown that traffic is worse despite the addition of an extra lane. This phenomenon, known as the law of induced demand, explains how travel time on the pass during rush hour has gone up by 50 percent in the past four years. According to the theory, when the supply of a good (in this case traffic lanes) is increased, more of that good will ultimately be consumed. “So you have a road that is every bit as congested, just wider,” Manville said. On possible fixes for the problem, Manville explained that establishing a toll system may be the best way to combat traffic: “When you do price the road, people switch to transit.” 


 

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