A crash occurred near exit 184 off of Interstate 25 in Castle Rock Sunday afternoon.A semi tractor with a fully loaded flat-bed trailer going southbound off the exit ramp failed to stop for vehicles in front of it and collided with six other vehicles, pushing many through the intersection.The semi took two of the cars downhill into a commercial parking lot and hit the back of a liquor store.All of the occupants of the vehicles have been extricated and transported to local hospitals as necessary. CSP says the extrication did take a while.