San Diego County, CA Mobility & Curb Rules: Bike Lane Rules (2026)

The ban in Section 72.230 is narrow by its own text: it reaches only sidewalks "in a business district," a term this division does not define locally. Section 72.3 fills that gap by incorporating whatever definition the term carries in the California Vehicle Code, so applying Section 72.230 means looking to state law to decide whether a given commercial strip qualifies. Outside a business district, this section says nothing about sidewalk riding one way or the other; it neither authorizes nor forbids it, so no county-wide sidewalk cycling ban exists in the unincorporated area.

Once a bicyclist is riding on the roadway rather than a sidewalk, Section 72.233 requires the rider to follow the same rules that bind motor-vehicle drivers under the County Traffic Code, and to receive the same rights, except for provisions that by their nature cannot apply to a bicycle. Enforcement runs through the sheriff's traffic deputies who patrol county roads under this division. Section 72.50 sets the penalty structure for the whole Traffic Code, including this ban: a first or second violation is an infraction, but a third or subsequent conviction for violating this division within two years of the first conviction becomes a misdemeanor, and each day the violation continues counts as a separate offense.

Because Section 72.50 does not set a dollar figure, the Code's default infraction fine schedule at Section 11.116(c) controls: up to $100 for a first violation, up to $200 for a second violation of the same provision within a year, and up to $500 for a third or later violation within that year. A misdemeanor conviction under Section 11.116(a) instead exposes a repeat rider to a fine of up to $1,000, up to six months in county jail, or both. This section governs only the county's unincorporated pockets; the 18 incorporated cities inside the county, including the City of San Diego, enforce their own bicycle and sidewalk codes.