A Sig Alert was issued for drivers headed onto the State Route 52 westbound before the Interstate 15 just after 6 a.m.
A vehicle collided with a semi at Santo Road and several responders have lanes blocked.
Traffic is only trickling through one lane past the scene and is backed up past Mission Gorge.
On the 52 west before Santo Road, an ambulance and the fire department have three lanes blocked and we’re seeing a big delay.
