Final answer:
A person should be able to walk at least 2 meters further than the width of a car before the car reaches them in order to cross the road safely.
Step-by-step explanation:
In order to determine how far away a car should be from a bicycle, we need to consider the time it takes for the car to reach the bicycle. Let's assume the average car length is 3.5 meters and the average car width is 2 meters. To cross the road safely, a person should be able to walk at least 2 meters further than the width of the car (a total distance of 4 meters) before the car reaches them. This distance will ensure that there is enough time for the person to safely cross without getting hit by the car.