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Speed and Stopping Distances Flashcards

7 cards from real DTT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Speed and Stopping Distances flashcards as text

  1. What is the default speed limit on a national road in Ireland when no other limit is posted?

    Answer: 100 km/h

    The default speed limit on national roads (N roads) in Ireland is 100 km/h when no other limit is displayed.

  2. What is the default speed limit for cars in a built-up area in Ireland?

    Answer: 50 km/h

    The default speed limit in a built-up area (urban area) in Ireland is 50 km/h unless road signs indicate otherwise.

  3. What is the national motorway speed limit for cars in Ireland?

    Answer: 120 km/h

    The speed limit on motorways in Ireland is 120 km/h for cars and motorcycles.

  4. What is the total stopping distance made up of?

    Answer: Reaction distance and braking distance

    Total stopping distance is the sum of reaction distance (the distance travelled while the driver reacts) and braking distance (distance to stop once brakes are applied).

  5. How does doubling your speed affect your braking distance?

    Answer: It quadruples

    Braking distance increases with the square of speed, so doubling your speed quadruples your braking distance.

  6. At 100 km/h on a dry road, approximately how long is the total stopping distance for a car?

    Answer: 75 metres

    At 100 km/h on a dry road, the total stopping distance is approximately 75 metres, combining reaction distance and braking distance.

  7. What effect does a wet road surface have on stopping distance compared to a dry road?

    Answer: At least doubles stopping distance

    A wet road significantly reduces tyre grip, which at least doubles stopping distance compared to a dry road.

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Sources & references

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  1. theorytest.ie — Eligibility, exam format, passing score, score validity, fees, time limit, exam information · verified Oct 2026
  2. rsa.ie — Test delivery, score release · verified Oct 2026