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North Carolina driving lesson · Defensive Driving & Hazards

Scanning, signaling & keeping a margin of safety

A 3-minute lesson from the North Carolina course. Read the rules and examples, follow the handbook page references, and check your understanding before you move on.

Read time
3 minutes
Course unit
Defensive Driving & Hazards
Checkpoint questions
5
Source pages
36

Defensive driving means seeing trouble early and letting others know what you'll do. Look well ahead, check behind you regularly, and signal every move, even when you think no one is around.

Scanning:

  • Look 10 to 15 seconds ahead (about one city block)
  • Check your mirrors about every 10 seconds
  • Check behind and blind spots when changing lanes, backing, slowing or going down a long hill
  • Never take your eyes off the road for more than an instant while checking mirrors
Handbook p. 36 ↗

Blind spots

Areas near the left and right rear corners you can't see in the mirrors. Glare, dirty windshields, parked cars, bushes and buildings can create more.

Handbook p. 36 ↗

Know the rule

Before any lane change or turn, quickly look over your shoulder to check the blind spot. Avoid lingering in other drivers' blind spots.

Handbook p. 36 ↗

Know the rule

Signal whenever you plan to slow down, stop, turn, change lanes or pull away from the curb, but first make sure the move is safe.

Handbook p. 36 ↗

How far ahead to signal

How far ahead to signal
Speed limitSignal at least
Below 45 mphThe last 100 feet before turning or stopping
45 mph or moreThe last 200 feet before turning
Handbook p. 36 ↗

Know the rule

Flashing turn signals are legal substitutes for hand signals and are enough at night, but can be hard to see when low sun reflects off the lenses in the early morning or late afternoon.

Handbook p. 36 ↗

Hand signals (left arm out the driver's window):

  • Left turn: arm and hand straight out, pointing the first finger
  • Right turn: arm straight out, forearm and hand straight up, palm forward
  • Stop or slow down: arm and hand pointing down, palm facing back
Handbook p. 36 ↗

Keeping a margin of safety:

  • Leave room ahead and behind to pass or stop safely
  • Drive at a steady speed and signal well before slowing or stopping
  • If someone tailgates, move to another lane and signal them to pass
  • Stay in the middle of your lane with space on both sides
Handbook p. 36 ↗

Know the rule

Facing two dangers at once, give the most room to the greatest or most likely danger. If they're equally hazardous, stop and let oncoming vehicles pass first.

Handbook p. 36 ↗

Put it into practice

Oncoming cars are on your left and a child is biking on your right. The child is more likely to make a sudden move, so give the child more room, even if that puts you a bit closer to the oncoming lane.

Check your understanding

Read the question, decide on an answer, then open it to check the explanation. These are Roadwise study questions based on the source handbook.

Where the speed limit is under 45 mph, how far before turning should you signal?
  1. At least the last 500 feet
  2. At least the last 20 feet
  3. At least the last 100 feet
  4. No specific distance is required

Answer: At least the last 100 feet

Signal at least the last 100 feet before turning or stopping.

Handbook p. 36 ↗
Where the speed limit is 45 mph or more, how far before turning should you signal?
  1. At least the last 100 feet
  2. At least the last 50 feet
  3. At least the last 500 feet
  4. At least the last 200 feet

Answer: At least the last 200 feet

If the speed limit is 45 mph or more, signal at least the last 200 feet before turning.

Handbook p. 36 ↗
About how far ahead should good drivers try to scan the roadway?
  1. 1 to 2 seconds ahead
  2. 30 to 45 seconds ahead
  3. Only the vehicle directly ahead
  4. 10 to 15 seconds ahead

Answer: 10 to 15 seconds ahead

Good drivers try to see 10 to 15 seconds ahead on the roadway, about one city block.

Handbook p. 36 ↗
How do you give a right-turn hand signal?
  1. Left arm straight out, forearm and hand up
  2. Left arm and hand pointing down
  3. Left arm straight out, pointing a finger
  4. Right arm straight out the passenger window

Answer: Left arm straight out, forearm and hand up

Hand signals use the left arm; for a right turn, hold the arm out with the forearm and hand straight up, palm forward.

Handbook p. 36 ↗
About how often should you check your mirrors to see whether a vehicle is following too closely?
  1. About every 10 seconds
  2. About every 30 seconds
  3. About every minute
  4. Only before changing lanes

Answer: About every 10 seconds

The handbook advises checking the mirrors about every 10 seconds.

Handbook p. 36 ↗
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