California embraces VMT metrics to asses project environmental impacts


A transformational shift in perspective is taking shape in California, where the state's transportation agency, Caltrans, is in the midst of alterings its project impact analysis metrics by abandoning LOS in lieu of VMT. 

Why is this important? Level of Service (LOS), on the one hand, measures the impact of a project on traffic flow in a given area, prioritizing the movement of cars over other factors. Because LOS is optimized for automobile traffic, project impact mitigation measures often favor reducing automobile congestion so that traffic can keep flowing. Common LOS-led responses to a high-impact projects include highway widening and the addition of new driving lanes, for example, approaches that often actually work to make traffic worse through the phenomenon of "induced demand." 

Vehicle Miles Traveled (VMT), on the other hand, measures the amount of travel generated for all vehicles by a given project. For projects that are measured against VMT, the goal shifts from reducing...

Antonio Pacheco via Archinect - News http://bit.ly/34sJkaz

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