SAN FRANCISCO-OAKLAND BAY BRIDGE (Privately maintained aids) Lights: Spans AB and DE. A fixed green light with 3 white lights in vertical line above center of channel through span, on each side of bridge; red axis lights on channelward face of piers. CAUTION: Mid-span clearance under the long spans of the San Francisco-Oakland Bay Bridge are approximate and at a temperature of 55°F/12.7°C. These clearances may be reduced several feet/meters due to extreme traffic conditions and a prolonged period of abnormally high temperature.