to OR 454. In cases where the highway number was already in use by a different route, the first digit of the new route number was changed to 5 (e.g. Cape Arago Hwy No. 240, designated OR 540 in 2003). Most of these new route numbers are unsigned as of 2015. Two state highways lack route numbers: Century Drive Hwy No. 372 and Midland Hwy No. 420. Cancelled or demolished highways The following highways were constructed and/or planned, and then subsequently demolished or cancelled. In some cases, the cancellation resulted from freeway revolts. Mount Hood Freeway (Approaches built, project cancelled in 1974) Rose City Freeway (Project cancelled in 1974) Harbor Drive (Built in 1950, demolished in 1974) Roosevelt Freeway (Project cancelled in 1978) West Eugene Parkway (Project cancelled in 2006) Interstate 305 (Partially built as an expressway in 1986) Interstate 505 (Partially built, main segment cancelled in 1979) Alsea-Deadwood Highway (OR 501) (Partially built, never finished, partial route still in use; complete route cancelled 1936. See also References External links Oregon Department of Transportation Oregon Highways (history of most highways) ORoads: Roads & Highways (detailed history of some highways)