Final answer:
When driving at night, it is necessary for drivers to maintain a greater distance from other vehicles than during the daytime due to reduced visibility.
Step-by-step explanation:
When driving at night, drivers need to leave more distance than they would in the daytime. This increased distance accounts for lower visibility and the need for more time to react to any potential hazards on the road. In situations with reduced visibility, it's crucial to adjust driving behavior to ensure safety.
Regarding how far away a car must be before it's safe to cross, a rule of thumb is to ensure multiple car-lengths to provide adequate space for crossing safely. For example, in a town or city where the speed limit is 60 km/h, it's important to cross the road at a point where you can walk further than the width of a car plus an additional 2 meters (4 meters in total), before the car reaches you.