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.
The rules that matter
- The posted limit is the maximum under ideal conditions, not a target. Rain, traffic, or fog can make a legal speed illegal.
- Basic speed law: you may never drive faster than is safe for current conditions, whatever the sign says.
- Keep at least three seconds of following distance, and add a second for each condition working against you.
- Stopping distance is reaction distance plus braking distance — and braking distance grows far faster than speed does.
- Roughly doubling your speed roughly quadruples the distance you need to stop.
- Check your blind spot with a head turn, not just a mirror, and stay out of everyone else's.
The lessons in this module
Each lesson is one short set of questions. If you've missed questions in this module before, a few come back at the start. Progress saves automatically; sign in only if you want cross-device sync.
Lesson videos
3 lessons · See all →Read this in the handbook
Look for these sections: Speed Limits, Following Distance, Stopping Distance.
Where these rules come from
We do not copy official handbooks — most states do not allow it. What we do instead: state the rule in our own words, then name the official document behind it. 186 questions in this module cite 80 official documents, none checked earlier than 2026-05-17. The 6 most-cited are below.
| Official document | Sections cited |
|---|---|
NHTSA Safe Driving ↗ National · Checked 2026-07-28 | ABS — Pedal Feedback, Blind Spot - Motorcycle Visibility, Blind Spots |
NHTSA Minimize Blind Spots ↗ National · Checked 2026-08-01 | |
NHTSA Ten Tips for Safe Driving ↗ National · Checked 2026-08-01 | Safe Driving Basics |
California Driver's Handbook ↗ State-specific · Checked 2026-07-28 | Advisory vs. Regulatory Speed, Basic Speed Law, Minimum Speed Limits |
California Driver's Handbook ↗ State-specific · Checked 2026-05-17 | General Driving |
California Driver's Handbook ↗ State-specific · Checked 2026-07-28 | Following Distance at 55 mph, Following Distance at Speed, Section 8: Safe Driving - Darkness |
Opening a source takes you to the agency's own site, never to a copy of ours. If a source is out of date or broken, say so from any question.
Practice this module
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Review these questions
Which factor does NOT directly increase your total stopping distance?
- A. Worn brake pads
- B. Wet or slippery road conditions
- C. The color of your vehicle
- D. Driving at high speeds
Show answer
C. The color of your vehicle — Vehicle color has no effect on stopping distance. Stopping distance is affected by speed, road conditions, tire quality, brake condition, driver reaction time, and vehicle weight.
Universal rule · checked against NHTSA Safe Driving — General Driving · verified 2026-05-17
The 'Basic Speed Law' means you can be cited for unsafe speed even when:
- A. Driving 5 mph over the limit in clear weather
- B. Driving exactly at the posted speed limit
- C. Driving below the posted speed limit if conditions are hazardous
- D. Driving on a road with no posted speed limit
Show answer
C. Driving below the posted speed limit if conditions are hazardous — The Basic Speed Law requires you to drive at a speed safe for actual conditions — fog, rain, heavy traffic, or road hazards may require driving well below the posted limit. The posted limit is the maximum, not a guaranteed safe speed.
Universal rule · checked against NHTSA Ten Tips for Safe Driving — Safe Driving Basics · verified 2026-08-01
What is the minimum following distance in good weather?
- A. 3 seconds
- B. 2 seconds
- C. 5 seconds
- D. 1 second
Show answer
A. 3 seconds — The three-second rule helps ensure adequate space to stop safely. Increase this in poor conditions.
Universal rule · checked against NHTSA Safe Driving — Tailgating and Following Distance · verified 2026-05-17
How should you adjust your side mirrors to minimize blind spots?
- A. Adjust outward so your own car is barely visible — maximize the coverage of the lane beside you
- B. Only adjust mirrors in daylight — mirror position matters at all times, not just daytime
- C. Adjust so you can see the rear corner of your own car in each mirror
- D. The default factory setting is optimized — do not adjust
Show answer
A. Adjust outward so your own car is barely visible — maximize the coverage of the lane beside you — Traditional advice says to angle mirrors to see your own car, but a better approach is to angle them outward (the 'BGE' method) so you can just barely not see your own car. This maximizes the side area you can see and minimizes the blind spot.
Universal rule · checked against NHTSA Safe Driving — Mirror Adjustment · verified 2026-07-28
Blind spots are areas:
- A. Not visible in your mirrors that require a head check
- B. Visible in your rearview mirror
- C. Only on the left side of your vehicle
- D. Only present on large trucks
Show answer
A. Not visible in your mirrors that require a head check — Blind spots are areas around your vehicle that cannot be seen in mirrors. Always do a head check before changing lanes.
Universal rule · checked against NHTSA Safe Driving — Blind Spots · verified 2026-05-17