Caltrans maintenance crews will be closing the northbound 15 to westbound 91 connector and the Main St. off-ramp in Corona for survey work on Saturday, Feb. 9 and Sunday, Feb. 10 from 5 a.m. to 10 a.m daily. Please reduce your speed in the work zone. Use Hidden Valley Pkwy. as a detour. For more info, visit the Caltrans website.