A curb that is painted red signifies the general regulation of no parking, no stopping and no standing. This law applies whether or not the vehicle is attended, states the San Francisco Municipal Transportation Agency.
Examples of places a curb may be painted red include: beside a fire hydrant; bus stops; edges of driveways; intersection corners and curb ramps. Additional regulations may be posted on signs, and these regulations apply regardless of curb color. Color-curb regulations are in effect 24 hours a day, seven days a week unless otherwise indicated by a sign. Other colors a curb may be painted include: yellow, white, green and blue. Each indicate a different restriction, states the SFMTA.
Yellow curbs typically signify a commercial-loading zone. Vehicles with a commercial license plate are allowed to park in yellow zones for 30 minutes as long as they are actively loading or unloading, claims the SFMTA. Vehicles without commercial license plates may load or unload in these zones but only for a maximum of five minutes.
White curbs signify passenger-loading zones, which allow vehicles to stop for a maximum of five minutes. Green curbs signify short-term parking, generally allowing vehicles to park for less than 10 minutes unless a meter is nearby. Blue curbs signify disabled parking, allowing only vehicles displaying a valid disabled-parking placard or license plate to park, according to SFMTA.