Drivers should be courteous and allow at least _ _ _ feet of clearance when passing a bicyclist on the road.

Drivers should be courteous and allow at least three feet of clearance when passing a bicyclist on the road.

Explanation:

The safety of people driving bycicles is really important and because of that in order to avoid accidents, the law has established that cars should give at least three feet when passing bicyclists on the road to ensure that there is enough space so they won't have to move laterally or that they won't have to make sudden moves to avoid a car which can cause a crash.

the answer to your question is,

d. when a child was born.

-mabel < 3