Final answer:
When driving a bus or truck, it is recommended to maintain a safe following distance of at least 4 seconds behind another bus or truck.
Step-by-step explanation:
When driving a bus or truck, it is recommended to maintain a safe following distance behind another bus or truck. The general rule of thumb is to stay at least 4 seconds behind the vehicle in front of you. This allows for sufficient time and distance to react and stop safely in case of sudden stops or emergencies.
To calculate the following distance, you can use the '4-second rule'. As the vehicle in front passes a fixed landmark, such as a sign or a tree, start counting 'one thousand and one, one thousand and two, one thousand and three, one thousand and four'. If you reach the landmark before finishing the count, you are following too closely and should increase your following distance.