Live Chat I-5 Community Nearby Traffic S21 2024-06-13 Roadnow Weather | Gas | Restaurants | Hotels | Car Repair | Convenience Stores Cities close to S21 Alpine, CA 0.00 Bonita, CA 0.00 Chula Vista, CA 0.00 Interstate highway exits close to S21 Exit 27, i8 17.96 Exit 23, i8 19.46 Exit 30, i8 20.62 Interstate highways close to S21 i8 map 17.96 i15 map 21.49 i805ca map 36.22 State roads close to S21 CA 78 map 3.49 CA 67 map 3.50 CA CR S4 map 13.86