Topic summary
Coast Highway 101

Extracted from the Wikipedia article California county routes in zone S.
S9
County Route S9 (CR S9), mostly known as Encinitas Boulevard, is a road in San Diego County, California, United States. Its west end is at CR S21 (Coast Highway 101) in Encinitas and its east end is at Paseo Delicias (CR S6) in Rancho Santa Fe.