Final answer:
Leaving several feet of extra space when passing a bicycle is mandated by law in many areas and ensures the safety of both the driver and the cyclist. It is a safety requirement that takes precedence over the marginal decrease in traffic flow efficiency.
Step-by-step explanation:
The question addresses the safety and traffic flow implications of drivers leaving several feet of extra space when passing a bicycle. Providing ample space when passing a bicycle is actually a safety requirement to protect both the driver and the bicyclist. Option 1 is inaccurate because it is typically safer for the driver to leave this space, preventing a collision with the bicyclist if they make sudden movements. Option 2 is also inaccurate because giving extra space increases the safety for the bicycle rider. Option 3 suggests that it is inefficient for traffic flow, but while it may slow traffic slightly, safety is prioritized over efficiency in this case. Lastly, Option 4, which is not a problem but a legal and safety requirement, is often the correct approach. Laws can vary by location, but many places do have laws requiring drivers to leave a certain amount of space, often at least 3 feet, when passing bikes to ensure safety.
The importance of these safety considerations is clear when discussing pedestrian or bicyclist safety overall. Examples provided in the questions relate to the distance required for safely crossing traffic, which applies similarly to bicycles—they need adequate space for safety in the event they need to avoid obstacles or hazards. A traffic signal can also enhance safety by regulating when pedestrians and cyclists can cross.