 SR 78 was originally formed along with the originally signed state highways in California ( Sign Routes ) in 1934 ; however , it only extended to what was then US 99 near Kane Springs . In the North County , SR 78 was legislatively designated as Route 196 from then @-@ US 101 ( present @-@ day I @-@ 5 ) to Vista , and as Route 77 from Vista to US 395 in Escondido . SR 78 was legally known as Route 197 from Escondido to Ramona , and Route 198 from Ramona to US 99 , which is now SR 86 . From the eastern junction of SR 86 to the Riverside county line , the route was designated as Route 146 in 1959 . 
