Tailgating is the practice of:

Tailgating refers specifically to following another vehicle too closely, which can be dangerous because it reduces the tailgating driver's ability to react and stop in time if the vehicle in front brakes suddenly. This practice compromises safety on the road as it increases the risk of rear-end collisions. Drivers should maintain a safe following distance, typically measured in seconds rather than in feet, allowing ample space to react to traffic conditions and ensure the safety of all road users.

Changing lanes frequently involves altering one’s position on the road, which could also be hazardous but does not pertain to maintaining distance between vehicles. Driving too slowly does not necessarily relate to the act of following another vehicle closely. Stopping suddenly can happen for various reasons but is not specifically defined as tailgating either. Overall, tailgating is about maintaining an inappropriate or unsafe distance behind a vehicle, which is why the correct identification of this behavior as following too closely is crucial for safe driving practices.