East of SR 39 , Imperial Highway was state - maintained .
East of SR 39 , Imperial Highway carried pre-1964 LR 176 and post-1964 SR 42 to its end at SR 91 .
East of SR 39 , Imperial Highway was state - maintained , and carried pre-1964 LR 176 and post-1964 SR 42 to its end at SR 91 .