Most bicycling is done in shared lane situations (since bike lanes are only possible on a subset of Oakland's roadways). Bicyclists and motorists can safely share the road (or the travel lane) by responding to the particular roadway configuration. The CVC states that bicyclists must, generally, ride to the right, but there are a number of exceptions that have relevance to Oakland, an older and constrained urban environment. The most important exception is CVC 21202 (a) (3) which states that bicyclists do not need to ride to the right "when reasonably necessary to avoid conditions (including, but not limited to, fixed or moving objects, vehicles, bicycles, pedestrians, animals, surface hazards, or substandard width lanes) that make it unsafe to continue along the right-hand curb or edge, subject to the provisions of Section 21656. For purposes of this section, a "substandard width lane" is a lane that is too narrow for a bicycle and a vehicle to travel safely side by side within the lane.
There are few roads in Oakland where it is safe to share a single lane side by side. Thus, in many locations bicyclists can legally ride in the middle of the travel lane. Motorists must exercise caution when passing. If there is one lane in a direction, motorists must wait until it is safe to pass, and bicyclists traveling below the prevailing speed should allow motorists to pass at the first safe opportunity. When there are two lanes in a direction, a motorist can safely pass by entering the adjacent travel lane. In both situations, motorists must leave sufficient space when passing—three feet is a good minimum—but more may be required when driving faster than 25 mph.