Document Type

Working Paper

Publication Date



Land use -- Planning -- Oregon, Transportation planning -- Oregon, Roads -- Interchanges and intersections -- Planning

Physical Description

1 online resource (20 pages)


In this paper we examine the effects of amendments to local comprehensive plans on interchange performance. Plan amendments over a 15-year period in Oregon resulting in changes to industrial or commercial land use were reviewed to identify those that occurred within one mile of an interchange. Regression analysis was then performed to estimate the impact of nearby plan amendments on subsequent interchange ADT. Plan amendments were found to have a substantial ADT effect on rural interchanges, but their incidence was very limited. In urban core areas, the estimated effect of plan amendments was negligible, possibly due to interchange congestion or effective land use planning. In urban fringe areas, plan amendments were estimated to account for about 5 percent of the subsequent interchange ADT, equivalent to about two years of the design life of these facilities.


Catalog Number DP05-1.

Published by Center for Urban Studies, College of Urban and Public Affairs, Portland State University.

Persistent Identifier