 Designated as Legislative Route Number 191, its former alignment continued east from the junction of US 66, former US 91 and former US 395 at Mount Vernon Avenue and 5th St, east along 5th Street and then north on E Street.E Street continued on to become modern Kendall Drive, rejoining the US 66 mainline at Cajon Boulevard near Devore.Part of this routing included the former alignment of State Route 18 prior to its truncation.