Whoops! How Planners and Engineers Badly Overestimate Car Traffic

World Streets: The Politics of Transport in Cities

From Streetsblog Daily, 12 Dec 2014 06:56 AM PST

Streetsblog - Trip generation manualHow much car traffic will a new building generate? Engineers and planners are constantly trying to divine the answer to this question in the belief that it will tell them the “right” number of parking spaces to build, or how to adjust streets to accommodate more cars.

This is the bible for planning infrastructure around new developments. Is it wildly wrong? Image: Access Magazine)

The standard reference to guide these decisions is the Trip Generation Manual published by the Institute for Transportation Engineers. But the manual has come under fire for overestimating the traffic produced by mixed-use developments. A team of transportation engineers aligned with the Congress for the New Urbanism has been working on a fix for that.

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