Following distance, headlights and signals

Key points

1. Keep at least 4 seconds between your car and the vehicle ahead.

   Source: Handbook p. 8-11

   “Keep at least 4 seconds between your car and the vehicle in front.”
   Maine Driver's License Manual, Handbook p. 8-11

2. Increase your following distance on slippery roads, because you will need more distance to stop.

   Source: Handbook p. 8-11

   “On slick roads. On slippery roads. If the car ahead should slow or stop, you will need more distance to stop your car.”
   Maine Driver's License Manual, Handbook p. 8-11

3. You need a 4 second gap to merge, change lanes or enter a freeway.

   Source: Handbook p. 8-15

   “Anytime you merge with other traffic, you need a gap of four seconds to merge safely. That will give both you and the car behind you a safe following distance. You need a four-second gap whenever you change lanes or enter a freeway from an entrance lane or merge with another road.”
   Maine Driver's License Manual, Handbook p. 8-15

4. Turn on headlights when you cannot see 1000 feet ahead or whenever your wipers are in constant use.

   Source: Handbook p. 8-16

   “By Maine law whenever visibility is too dim for you to see 1000 feet ahead or at any time when windshield wipers are in constant use you must turn on the headlights”
   Maine Driver's License Manual, Handbook p. 8-16

5. Headlights are required from sunset to sunrise.

   Source: Handbook p. 8-16

   “By Maine law you must have headlights on when driving anytime from sunset to sunrise.”
   Maine Driver's License Manual, Handbook p. 8-16

6. Dim your high beams within 500 feet of an oncoming vehicle or 300 feet when following one.

   Source: Handbook p. 8-16

   “When a vehicle equipped with multiple beam road lights approaches an oncoming vehicle within 500 feet or follows a vehicle within 300 feet, the operator shall dim the headlights”
   Maine Driver's License Manual, Handbook p. 8-16

7. Use low beams in fog, snow or heavy rain to avoid glare.

   Source: Handbook p. 8-16

   “Use low beams in fog, snow, or heavy rain as light from your own high beams will reflect back on you”
   Maine Driver's License Manual, Handbook p. 8-16

8. Signal at least 100 feet before any change or turn.

   Source: Handbook p. 8-18

   “Signal as early as you can-at least 100 feet before any change or turn.”
   Maine Driver's License Manual, Handbook p. 8-18

9. If your car breaks down, place emergency flares at least 100 feet behind it.

   Source: Handbook p. 8-18

   “If you have emergency flares place them at least 100 feet behind the car”
   Maine Driver's License Manual, Handbook p. 8-18

Numbers to know

3 questions from the Maine practice test

1. 1. What minimum following distance does Maine's manual recommend between your car and the vehicle ahead?

   1. One second at every speed
   2. At least four seconds
   3. One car length regardless of speed
   4. Exactly ten seconds in normal conditions
   Show answer

   At least four seconds. The manual sets at least four seconds as the normal following cushion. Measure it by watching the vehicle ahead pass a fixed point, then counting until your car reaches that point. One second and one car length may disappear too quickly when speed or road conditions change. Ten seconds is not the normal minimum. Add more space on slick roads, behind motorcycles or bicycles, and when following large vehicles.

2. 2. How large a gap does the Maine manual recommend for merging with traffic?

   1. A gap of exactly one car length
   2. A gap of one second
   3. A gap of four seconds
   4. A gap of ten vehicle lengths
   Show answer

   A gap of four seconds. Merging safely requires a four-second gap so both your vehicle and the car behind you have a safe following distance. The one-second and one-car-length choices are too small to provide dependable reaction room. Ten vehicle lengths is not the manual's measurement and varies with vehicle size. Do not squeeze into a narrow opening. If several lanes must be crossed, change one lane at a time.

3. 3. When must Maine drivers turn on their headlights because of visibility or wiper use?

   1. Only when visibility falls below 100 feet
   2. When visibility is too dim to see 1,000 feet ahead or the windshield wipers are in constant use
   3. Whenever the vehicle is stopped at a red light
   4. Only after sunset, never during rain or fog
   Show answer

   When visibility is too dim to see 1,000 feet ahead or the windshield wipers are in constant use. Maine requires headlights when visibility is too dim to see 1,000 feet ahead or whenever the windshield wipers are in constant use. The rule therefore covers weather and other low-visibility conditions before darkness arrives. A 100-foot threshold is far too limited, a stopped red light does not trigger the rule by itself, and rain or fog can require lights before sunset. Turning them on also helps others see your vehicle.

Source: the Maine Driver's License Manual, Section 8: Managing Time and Space. This lesson is a plain English summary, not the law itself; where it differs, the manual and the statute govern. Last checked 2026-09-27.