Pre-Drive Safety Checkups

Req 3 — Maintenance and Emergency Stops

3.
Auto Maintenance and Safety Checkups. With adult supervision and using a vehicle that you have access to, do the following:

A safe driver still needs a safe vehicle. This requirement is a hands-on inspection page: lights, windows, wipers, tires, emergency tire tools, and stopping-distance awareness. Treat it like a preflight check for a trip. Small problems that seem annoying in the driveway can become dangerous at speed.

Requirement 3a

3a.
Demonstrate that all driving lights and signaling lights are clear and operational. Show where the switches are for these lights. Explain how drivers use lights to drive safely and courteously and to communicate with other drivers.

Lights do two jobs at once: they help you see and they help other people understand what you are about to do. A burned-out signal light or dirty taillight removes information other drivers depend on.

What to check

Walk around the vehicle with an adult and test:

Make sure the lenses are not caked with mud, snow, or road salt. Then sit in the driver’s seat and identify the switches so you know how to use them quickly.

Types of Car Lights & Their Purposes (video)

Requirement 3b

3b.
Explain issues that might affect the driver’s ability to see through the front, rear, and side windows. Demonstrate with a smear-and-clear test if the windshield wiper blades will clear the windshield completely or need to be replaced. Describe instances in good and bad weather when windshield wipers are important to safe driving.

A driver cannot respond to what they cannot see. Visibility problems include dirt, inside fogging, cracked glass, frost, glare, water film, worn wipers, and clutter stacked so high in the back seat that it blocks the rear window.

The smear-and-clear test

Spray washer fluid or water onto the windshield and run the wipers. Good blades should clear the glass smoothly. Bad blades chatter, skip, streak, or leave a greasy film that catches headlights.

Visibility problems to notice

Look through every window, not just the windshield
  • Front: Bug splatter, glare, frost, streaks, cracks
  • Rear: Dirt, fog, cargo blocking the view
  • Side windows and mirrors: Rain spots, ice, dirt, poor adjustment
  • Weather: Mist, heavy rain, snow spray, road slush
How to Check Your Wipers (video)

Requirement 3c

3c.
Demonstrate how to find the vehicle’s recommended tire pressures, how to check tire pressures, and how to check for adequate tire tread depth. Explain why proper tire pressure and tread depth are important to traction, stopping distances, tire wear, and fuel economy.

Your tires are the only parts of the vehicle touching the road. All braking, turning, and accelerating depend on those four contact patches. That is why tire condition matters so much.

The recommended tire pressure is usually found on a sticker inside the driver’s door frame, not on the maximum-pressure number molded into the tire sidewall. Use a tire gauge when the tires are cold. For tread, many people use the penny test, but any tread-depth gauge works even better.

Why pressure and tread matter

How to Check Your Tires (video)
Annotated photo of a Scout checking tire pressure with a gauge and measuring tire tread depth on a parked car

Requirement 3d

3d.
Check the vehicle for tools needed to change a flat tire or to use tire sealant to fix a puncture. Demonstrate you know how to change a flat tire and how to use tire sealant.

A flat tire feels like a problem you can solve later until it happens in the rain, after dark, or on a shoulder with traffic rushing by. Knowing where the tools are and how they work turns panic into a checklist.

Tools to locate first

Most vehicles that still carry a spare tire also carry:

Some newer vehicles replace the spare with an inflator-and-sealant kit. That can temporarily seal some punctures, but not sidewall damage or major tire failures.

Safe flat-tire habits

Steps to explain in your demonstration

  1. secure the vehicle on level ground
  2. set the parking brake and hazards
  3. place the jack at the correct lift point
  4. loosen lug nuts before fully lifting if appropriate
  5. lift the vehicle enough to remove and replace the tire
  6. tighten lug nuts in a star pattern
  7. lower the vehicle and retighten
  8. check the repaired or replacement tire as soon as possible
Tire Inflator and Sealant Kit (video)

Requirement 3e

3e.
In a location away from traffic hazards, mark off the reaction distances and braking distances that a car will travel as it makes an emergency stop at 25, 55, and 70 miles per hour on level dry and level wet pavement. Discuss how these distances change for normal and impaired drivers, for day and night driving, and for weather conditions. Note: Use the graphics template in the Traffic Safety merit badge pamphlet or one approved by your counselor to set up this demonstration.

This is one of the best reality checks in the badge. Many people think of stopping as one event, but it has two major parts:

At higher speeds, both distances grow, and braking distance grows especially fast. Wet pavement lengthens stopping distance even more because tires have less grip.

What your demonstration should show

Use a safe location away from traffic and the official graphic template or another counselor-approved one. Mark the distances for:

The point is not to memorize a single number. The point is to see how much ground a vehicle covers before it can stop.

Stopping Distance Table and Graphs (PDF) The official distance chart and graph set you can use to mark off emergency-stop distances for the required demonstration. Link: Stopping Distance Table and Graphs (PDF) — https://filestore.scouting.org/filestore/Merit_Badge_ReqandRes/Requirement%20Resources/Traffic%20Safety/Stopping%20Distances%20Table%20and%20Graphs.pdf?_t=1764661254
Thinking, Braking, and Stopping Distances (video)
Stopping Distance Demonstration (video)

By this point you have looked at the driver, the vehicle, and the stopping space needed to avoid a crash. Next, you will look at the laws and procedures that shape what drivers must do on public roads.