June 23, 2014 | oregonlive.com-- In deciding how much to bill each of the city's 62,672 businesses under a proposed fee for road repair, Portland Mayor Charlie Hales and Commissioner Steve Novick turned to an obscure compendium of transportation data that Novick admits might seem like "black magic."
The 2,000-page encyclopedia of numbers is called the Institute of Transportation Engineers Trip Generation Manual. It was designed to be a reference guide for cities and developers to estimate how much traffic will grow once a new development is built, not as the formula behind a new revenue source. Only Oregon and three other states use it for that purpose.
The multi-volume manual in some cases relies on data collected as early as the 1960s, before the Fremont Bridge was constructed and when Harbor Drive still carved through what's now Tom McCall Waterfront Park in downtown Portland. READ FULL ARTICLE