roadwise.Open study app

Nevada driving lesson · Driver Assistance Technology

Detection & alert systems

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

Study this lesson in the app Back to the course
Read time
3 minutes
Course unit
Driver Assistance Technology
Checkpoint questions
4
Source pages
52, 53

Detection systems watch for things you might miss — cyclists, pedestrians, stopped cars and lane lines. Learn how your car warns you, and never count on a system to see what you haven't.

Know the rule

Bicycle, pedestrian and obstacle detection works at low speeds — generally around 25 mph. Some systems only detect objects directly in front of you moving in the same direction; some brake automatically.

Handbook p. 52 ↗

Know the rule

Read your owner's manual to learn how you'll be warned. Beeps may speed up as you get closer to an obstacle; continuous beeps may mean a collision is imminent.

Handbook p. 52 ↗

Know the rule

Don't depend on bicycle, pedestrian or obstacle detection — check for them regularly yourself, especially in urban areas.

Handbook p. 53 ↗

Alert technologies

Alert technologies
SystemWhat it does
Forward collision warningWarns of slower or stopped objects ahead; won't brake
High speed alertSounds when you're speeding
Lane departure warningVisual, vibration or sound warning when you drift
Parking sensorsShow objects around you; a constant tone = too close
Rear cross-traffic alertWarns of vehicles about to enter your backing path
Handbook p. 53 ↗

Know the rule

Forward collision warning scans the road ahead so you can brake or swerve in time — the warning system alone will not brake for you.

Handbook p. 53 ↗

Know the rule

Lane departure warning helps you steer back to the center of your lane if you drift by mistake, helping prevent a crash.

Handbook p. 53 ↗

Put it into practice

Backing out of a grocery-store space, your rear cross-traffic alert chimes. A car is about to cross behind you — stop, let it pass, and look again yourself before reversing.

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.

Lane Departure Warning differs from Lane Keeping Assist because Lane Departure Warning:
  1. Automatically steers the vehicle back into the lane
  2. Only functions on freeways
  3. Only warns the driver, it does not steer the vehicle
  4. Applies the brakes automatically

Answer: Only warns the driver, it does not steer the vehicle

Lane Departure Warning only warns; Lane Keeping Assist can actively steer the vehicle back.

Handbook p. 53 ↗
While parking, your car's parking sensors sound a constant tone. What does this mean?
  1. A vehicle is approaching from the side
  2. The system is malfunctioning
  3. You're too close to an object
  4. You have room to keep moving

Answer: You're too close to an object

With parking sensors, a constant tone means the vehicle is too close to an object.

Handbook p. 53 ↗
Forward Collision Warning systems will automatically brake the vehicle for the driver.
  1. True
  2. False

Answer: False

The warning system alone will not automatically brake; it warns so the driver can brake or swerve.

Handbook p. 53 ↗
Detection technologies for pedestrians and obstacles generally work at low speeds, around 25 mph.
  1. True
  2. False

Answer: True

These systems generally detect pedestrians, bicyclists, or obstacles at low speeds, around 25 mph.

Handbook p. 52 ↗
Take the lesson checkpoint in the app

More in Driver Assistance Technology

All Nevada lessons