Final answer:
The recommended following distance when driving behind another vehicle is typically a three-second gap under normal driving conditions. The correct answer is option b.
Step-by-step explanation:
When following another vehicle, it is recommended to maintain a three-second following distance under normal driving conditions. This three-second rule helps ensure that you have enough time to react and stop safely if the vehicle in front of you brakes suddenly.
To gauge this, you can pick a fixed point on the road ahead such as a sign or a tree. When the rear of the vehicle in front of you passes that point, you should not reach it for at least three seconds. This is known as the three-second rule, and it's a crucial aspect of safe driving.
Bridget's observation from her classroom window also ties into understanding the importance of timing and distance when it comes to vehicle speeds and safety on the roads, though it does not directly inform the question of following distance.