DTT Cheat Sheet 2026

The 30 highest-yield DTT facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What does a circular sign showing two red arrows pointing in opposite directions (up and down) mean? → No overtaking in either direction
2. How close to a pedestrian crossing may you park your vehicle? → Not within 15 metres before the crossing
3. When can you legally use a mobile phone while driving in Ireland? → Only when using a hands-free device that does not require holding the phone
4. What does reaction distance depend on? → The driver's speed and reaction time
5. What does a rectangular blue sign with a white 'P' indicate? → Parking is permitted
6. What is the default speed limit for cars in a built-up area in Ireland? → 50 km/h
7. You are driving on a residential street and see a ball rolling onto the road from behind a parked car. What hazard should you anticipate? → A child may follow the ball onto the road
8. What is the safest way to designate a driver when going out with a group? → Nominate one person before going out who agrees to drink no alcohol for the evening
9. A vehicle with a blue flashing light but no siren approaches. What should you do? → Move safely out of its way — blue lights indicate an emergency vehicle
10. When are you permitted to overtake on the left in Ireland? → When the vehicle ahead has signalled and is turning right
11. What does the power steering warning light indicate? → The power steering system has a fault — steering will be heavier and more difficult
12. Who has priority at an uncontrolled T-junction in Ireland? → Traffic on the continuing road (the top of the T)
13. What does a rectangular blue sign with a white 'P' indicate? → A parking area is available
14. Which of these is a common effect of alcohol that increases collision risk? → Tunnel vision — reduced peripheral vision
15. When must you stop for a school warden (lollipop person) in Ireland? → Whenever they step into the road and display their sign
16. How often must a car undergo a National Car Test (NCT) in Ireland for a vehicle first registered more than 10 years ago? → Every year
17. How should you check if your headlights are working correctly? → Switch them on and walk around the vehicle, or check reflections in a window or wall
18. In Ireland, at what age may a person apply for a learner permit to drive a Category B car? → 17 years old
19. What should you do if you feel drowsy while driving on a motorway? → Exit at the nearest junction, park safely, and take a break or short nap
20. When driving in heavy rain, your stopping distance compared to dry conditions is approximately: → Doubled
21. Can you be prosecuted for drink driving the morning after drinking heavily? → Yes — if your BAC is still above the legal limit the morning after
22. What should you do if your car skids on ice due to over-braking? → Release the brake, steer gently in the direction of the skid, and reapply brakes gently
23. When can you use a bus lane in Ireland (as a car driver)? → Only outside the hours shown on the bus lane sign
24. What is 'tailgating' and why is it dangerous? → Following too closely, reducing reaction time and stopping distance
25. If a Garda suspects a driver of drink driving, what test can they require at the roadside? → A preliminary breath test using a breathalyser
26. What checks should you do on the windscreen and windows before driving? → Ensure they are clear of frost, condensation, dirt, and cracks that impair visibility
27. What are the dangers of driving with underinflated tyres? → Increased stopping distance, poor handling, overheating, and possible tyre failure
28. What should you do when you see an amber traffic light? → Stop before the stop line if it is safe to do so
29. What does a sign with a red circle and a bicycle inside it mean? → No cyclists permitted
30. What is the safest approach to alcohol if you plan to drive? → Do not drink any alcohol before driving