Speed and Space Management Flashcards

What is the recommended following distance for a heavy vehicle traveling under 40 mph?

Answer: 1 second for every 10 feet of vehicle length

Below 40 mph, allow one second of following distance for each 10 feet of vehicle length.

When traveling over 40 mph, how should a driver adjust the following-distance formula?

Answer: Add one second to the low-speed count

Over 40 mph you add one additional second to the length-based following distance.

Why do heavy vehicles need more following distance than cars?

Answer: They take longer to stop

Their greater weight and length mean longer stopping distances than passenger cars.

What is 'total stopping distance' composed of?

Answer: Perception, reaction, and braking distance

Total stopping distance = perception distance + reaction distance + braking distance.

How does empty trailer weight affect braking?

Answer: Empty trucks can take longer to stop due to less traction

Empty trucks have less traction, so brakes can lock up and stopping can actually take longer.

At about what speed does stopping distance roughly quadruple compared to half that speed?

Answer: Doubling speed multiplies braking distance by about four

When you double your speed, braking distance increases about four times.

What should you do when following distance is compromised by a tailgater behind you?

Answer: Increase your following distance in front

Open up more space ahead so you can brake gradually and give the tailgater room.