Riverside Police and the Highway Patrol routinely run radar on I-635 in the north and southbound lanes. The enforcement is usually very early in the morning or in the middle of the afternoon. If you are traveling in the southbound lanes, slow down before you approach 9 highway. The officer will sit on the top of the hill with his lights turned off, and it will be too late by the time you see him. They also sit on the exit ramps from 9 Highway.