Final answer:
When a vehicle follows another vehicle too closely, it means that it is driving very close behind the vehicle in front of it, with insufficient space between them. This behavior is dangerous and can lead to rear-end collisions.
Step-by-step explanation:
When a vehicle follows another vehicle too closely, it means that it is driving very close behind the vehicle in front of it, with insufficient space between them. This behavior is dangerous as it reduces the time and distance available to react in case the vehicle in front suddenly slows down or stops. Tailgating, as it is commonly referred to, is a common cause of rear-end collisions.
For example, if a driver is driving so close to the car in front that they cannot see its rear tires touching the ground, they are following too closely. Another way to determine if a driver is following too closely is if their reaction time to the car in front's brake lights is less than two seconds.