DUI arrests are most likely in Carlsbad in five different areas. These areas see the most traffic and are patrolled more than the residential areas. Some areas have both Carlsbad Police and California Highway Patrol actively involved in DUI enforcement. The areas patrolled by both Carlsbad Police and CHP are the freeways I-5 and the "78". The Coast Highway and El Camino Real are also major roads which are heavily patrolled and subject to DUI Checkpoints.