If you are driving a 40-foot bus at 30 mph on dry, clear roads, how many seconds of space should you maintain in front?

If you are driving a 40-foot bus at 30 mph on dry, clear roads, how many seconds of space should you maintain in front?

• A. 3 seconds
• B. 4 seconds
• C. 5 seconds
• D. 6 seconds

Answer: (B)

Safe following distance for a large vehicle. When you’re driving a 40-foot bus at 30 mph on dry, clear roads, the standard minimum is about four seconds of space in front. Heavy, long vehicles need more time to stop than cars, due to their weight and braking distance, plus the driver’s perception-reaction time. At 30 mph, you cover roughly 44 feet every second, so four seconds gives about 176 feet of space. That margin helps ensure you won’t collide if the bus ahead brakes suddenly and accounts for your own need to react and brake safely. Three seconds would narrow that gap to about 132 feet, which isn’t sufficient for a bus, while five or six seconds would be extra cautious but is not the typical minimum in ideal conditions.

Safe following distance for a large vehicle. When you’re driving a 40-foot bus at 30 mph on dry, clear roads, the standard minimum is about four seconds of space in front. Heavy, long vehicles need more time to stop than cars, due to their weight and braking distance, plus the driver’s perception-reaction time. At 30 mph, you cover roughly 44 feet every second, so four seconds gives about 176 feet of space. That margin helps ensure you won’t collide if the bus ahead brakes suddenly and accounts for your own need to react and brake safely. Three seconds would narrow that gap to about 132 feet, which isn’t sufficient for a bus, while five or six seconds would be extra cautious but is not the typical minimum in ideal conditions.