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Vehicles without a commercial license plate may use yellow zones for up to three minutes for active loading only, and the driver must stay with the vehicle. Vehicles parked in a yellow zone but not loading, or in excess of the time limit for the vehicle type, may be cited and towed.

Here's what the California Driver Handbook says: Red: No stopping, standing, or parking. Red zones are usually for emergency vehicles only, as well as fire hydrants. You cannot park in front or, or block, a fire hydrant. Buses may stop at a red curb if it's marked OK for buses to stop there.

Some driveways have red zones marked on either side of the curb cut to provide additional clearance for vehicles to access the driveway. These are each typically two feet wide and marked with red paint and an official “SFMTA” or “MTA” stencil.

SFMTA.com/RedZone. Driveway Red Zones provide additional clearance for vehicles accessing off-street parking. They are installed next to active residential driveways. They are typically two feet long and installed on both sides of a driveway.

Effective days and hours are posted on nearby signs or stencils on the curb. They are meant for active passenger loading, and drivers must remain with the vehicle at all times (except at preschools and hospitals). Vehicles parked for more than five minutes in a white zone are subject to citation and towing.

Accessible parking (“blue”) zones and driveway red zones are active 24 hours a day. Commercial loading (“yellow”) zones, passenger loading (“white”) zones, general loading zones, and short-term parking (“green”) zones are typically active only at certain times and revert to general parking when not active.

Painted colored curbs have special parking rules. White: Stop only long enough to pick up or drop off passengers. Green: Park for a limited time. The time limit may be posted on signs or painted on the curb. Yellow: Load and unload passengers and freight.

120 Red zone—No parking. As required under California Vehicle Code Section 21458, a curb painted red shall indicate no stopping, standing, or parking whether the vehicle is attended or unattended, except that a bus may stop in a red zone marked or sign posted as a bus loading zone.