Live Chat I-5 Community Nearby Traffic S21 2024-06-12 Roadnow Weather | Gas | Restaurants | Hotels | Car Repair | Convenience Stores Cities close to S21 Coronado, CA 4.25 National City, CA 8.49 Lemon Grove, CA 12.15 Interstate highway exits close to S21 Exit 16b, i5 0.49 Exit 16a, i5 0.81 Exit 17a, i5 0.94 Interstate highways close to S21 i5 map 0.49 i15 map 4.17 i8 map 4.77 State roads close to S21 163 SOUTHBOUND map 0.64 163 NORTHBOUND map 0.72 94 WESTBOUND map 1.46