Speed & Space Management
Control speed, following distance, and the space cushion around you.
Space is the currency of safe driving, and this module is about how to spend it. Study how speed choices, following distance, stopping distance, and blind-spot checks work as one system, because the exam keeps returning to a single idea: leave enough room to see, decide, and stop before a hazard becomes a collision.
Read this in the handbook
Start with the handbook sections that match this module, then come back for sample questions and drills.
Lesson videos
Practice speed & space management questions
Why does doubling your speed more than double your stopping distance?
- A. It doesn't — stopping distance increases proportionally with speed
- B. Reaction time also increases at higher speeds
- C. Because braking distance increases with the square of speed: doubling speed quadruples braking distance
- D. Higher speeds cause tire pressure to decrease, reducing braking efficiency
Show answer
C. Because braking distance increases with the square of speed: doubling speed quadruples braking distance — Braking distance increases as the square of speed. At 30 mph, braking distance is X; at 60 mph (double), braking distance is 4X. Perception/reaction distance also increases with speed since you cover more ground per second.
Why should you increase following distance when being tailgated?
- A. To give the tailgater more room to pass on the right according to regulations
- B. Increasing your following distance gives you more reaction time before needing to brake hard - reducing the likelihood of a chain-reaction collision if you need to slow suddenly
- C. You should not change behavior because of tailgaters
- D. To allow the tailgater to see your brake lights sooner
Show answer
B. Increasing your following distance gives you more reaction time before needing to brake hard - reducing the likelihood of a chain-reaction collision if you need to slow suddenly — When tailgated: increase your following distance in front. More space ahead means you can decelerate more gradually if needed, reducing the likelihood that your brake lights trigger a rear-end collision from the tailgating driver.
Work zones usually require you to:
- A. Maintain normal speed
- B. Change lanes frequently
- C. Reduce speed significantly
- D. Use hazard lights
Show answer
C. Reduce speed significantly — Work zones have reduced speed limits for the safety of workers. Fines are often doubled in these zones.
A common cause of lane change crashes is:
- A. Failing to check blind spots — only using mirrors without a head check before changing lanes
- B. Signaling too far in advance of the lane change
- C. Changing lanes too slowly for the flow of traffic
- D. Braking too hard during the lane change
Show answer
A. Failing to check blind spots — only using mirrors without a head check before changing lanes — The most common cause of lane change crashes is failing to check the blind spot. Mirrors do not show the area beside you. Always signal, check mirrors, then turn your head to physically check the blind spot before every lane change.
The 'four-second rule' compared to the 'two-second rule' is recommended when:
- A. Driving at speeds below 25 mph
- B. Always — four seconds is always better
- C. Only for drivers over 65 when applicable to your jurisdiction
- D. In adverse conditions — rain, fog, reduced visibility, fatigue, towing, heavy traffic, or night driving
Show answer
D. In adverse conditions — rain, fog, reduced visibility, fatigue, towing, heavy traffic, or night driving — Double your following distance (to 4+ seconds) in adverse conditions: wet roads, fog, snow, ice, fatigue, when towing, or at night. These conditions significantly increase stopping distance and reaction time.
Get the full question bank, targeted drills, and mastery tracking in the free app.
