Interstate 205 was possibly designated as a branch of I-5 because it was originally to connect with Interstate 5W. Interstate 5W was renumbered as part of I-580 in 1964.
Due to its role as a commuter route, the eastern end of Interstate 205 was widened from four to six lanes in 2007/08. I-205 expansion followed the four-laning of the SR 120 freeway across Manteca, which accounted for the increase in traffic demands.
East End – Lathrop, California
Throwback – South to
Former button copy signs for the separation of Interstate 205 west from I-5 (Westside Highway) south. Photos taken 07/03/04.
West End – Mountain House, California
Throwback – East at
Replaced button copy signs at the split of Interstate 205 east from I-580. Photos taken 07/06/04.