Editing Interstate 505 (section)

==History==
What is now I-505 was originally conceived as part of a loop Interstate with a directional suffix, I-5W.<ref name="cahighways_5">{{cite web | url=http://cahighways.org/001-008.html#005 | title=California Highways-Routes 1-8 | work=California Highways | access-date=2012-09-03}}</ref> However, I-5W and most of the other Interstates around the country with directional suffixes were eventually renumbered or eliminated, except [[Interstate 35E (disambiguation)|I-35E]] and [[Interstate 35W (disambiguation)|I-35W]] in Texas and Minnesota. [[Interstate 69|I-69]] segments [[I-69W]], [[I-69C]], and [[I-69E]] in southern Texas have since been designated as well along with proposed suffixed segments for future extensions of [[Interstate 14#Proposed extension|I-14]] and [[Interstate 27#Numbering|I-27]] to follow. The former route of I-5W now corresponds to [[Interstate 580 (California)|I-580]] from I-5 south of [[Tracy, California|Tracy]] to [[Oakland, California|Oakland]], [[Interstate 80 in California|I-80]] from Oakland to Vacaville, and I-505 from Vacaville to I-5 near Dunnigan.

The northernmost section of I-505, between SR 16 in Madison and I-5 near Dunnigan, opened in August 1977.<ref>{{cite news |date=August 11, 1977 |title=I-505 Stretch In Yolo To Open |page=B2 |work=The Sacramento Bee |url=https://www.newspapers.com/clip/89608852/i-505-stretch-in-yolo-to-open/ |via=[[Newspapers.com]] |access-date=November 26, 2021}}</ref>
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