Final answer:
A bicyclist should ride as close to the right curb as possible when there is no bicycle lane.
Step-by-step explanation:
Where there is no bicycle lane, a bicyclist should ride as close to the right curb as possible. This allows vehicles to pass safely on the left and also ensures that the bicyclist is following the rules of the road, which typically require non-motorized vehicles to stay to the right. In situations where there are hazards or the road is too narrow for a car to safely pass a bicyclist, the bicyclist may use the full lane, but this should be done with caution and awareness of surrounding traffic.