Why can going slower than other vehicles be dangerous?

Going slower than the flow of traffic can be dangerous primarily because vehicles may bunch up behind you, increasing the risk of a rear-end collision. When you are driving significantly slower than other vehicles, those behind you may not anticipate your speed or may be unable to change lanes safely, leading to a buildup of traffic. If the vehicles behind you do not have adequate space to safely maneuver around you, or if they misjudge the distance, it could result in crashes, particularly if they are unable to stop in time.

Maintaining a speed similar to that of other vehicles helps ensure a smooth flow of traffic and reduces the risk of accidents caused by sudden stops or changes in speed. On the other hand, while the other options touch on valid points, they do not directly relate to the immediate danger associated with impeding the flow of traffic.