Comprehensive Plan Amendment Impacts on Interchanges in Oregon

Abstract

This report examines the effects of amendments to local comprehensive plans on interchange performance on the Oregon highway system. 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 average daily traffic (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% of the subsequent interchange ADT, equivalent to about two years of the design life of these facilities. Case studies involving plan amendment activity over time near six interchanges revealed that traffic impacts were rarely identified by local planning jurisdictions and that the Oregon Department of Transportation (ODOT) was rarely involved in the review process. Recent changes in transportation planning and programming requirements will result in greater consideration of development activity in interchange areas. Interchange area management plans are now required in cases of interchange construction or improvement. Changes in the Department of Land Conservation and Development's Transportation Planning Rule also provide for direct involvement of ODOT in the review of plan amendments in interchange areas.

Cite this work

No public copy is stored for this record, so only the metadata is cited.

Stored only when both papers are in the corpus — 3 citations exist upstream.

Papers that cite the same references — the relational fallback while embeddings are still backfilling.