What factor can contribute to a driver becoming aggressive while on the road?

Unexpected delays or interruptions can lead to a driver becoming aggressive while on the road because these situations often cause frustration and impatience. When drivers anticipate smooth travel but encounter unforeseen issues, such as traffic jams, construction, or accidents, it can trigger stress and anxiety. This emotional state might lead to aggressive behaviors such as tailgating, weaving in and out of traffic, or reacting angrily to other road users.

In contrast, predictable traffic patterns and realistic travel time expectations generally help drivers maintain a calm demeanor since they can plan their journeys better. Consistent checking of mirrors is a safe driving practice, helping drivers stay aware of their surroundings, which can reduce the likelihood of aggressive behavior as well. Therefore, unexpected delays create a psychological environment where aggression can more easily occur, distinguishing it from the other choices.