Hazard Perception Test: How It Works & How to Pass
The most-failed part of the theory test. Pass mark is 44/75 across 14 clips. The clicking pattern matters as much as the spotting.
How It Works
- 14 one-minute computer-generated (CGI) clips shown from the driver's seat; the DVSA switched from filmed footage to CGI in January 2015.
- 15 developing hazards in total. One clip contains two; you will not know which.
- Click the mouse the moment a hazard begins to develop, then a confirming click slightly later.
- Pass mark: 44 out of 75.
The Scoring Window
Each developing hazard has a five-second scoring window. Click as the hazard starts and you score 5. Wait too long and you score 1, 0 or nothing.
Earlier the click within the window, higher the score. Click before the window opens or after it closes and the hazard scores zero.
Developing Hazard vs Static Hazard
Only developing hazards score. A static feature in the scene is not a hazard until it changes the action you would take as a driver.
Not a hazard (static)
- A parked car at the kerb
- A pedestrian standing on the pavement
- A cyclist riding straight ahead with no change
- A bus parked at a stop
Hazard (developing)
- That parked car's door opening
- The pedestrian stepping into the road
- The cyclist starting to swerve around a drain
- The bus indicating to pull out
The Clicking Rule
One + one click
First click as the hazard starts, second confirming click 1-2 seconds later. Best chance of catching the 5-point window.
Two or three clicks
Tolerable; spaced at varying intervals. Helps if you genuinely see the hazard developing in stages.
Rapid even clicking
Five-plus rhythmic clicks per clip triggers the anti-cheat algorithm. Score for that clip drops to zero, no matter how good your timing was.
Visual Conditions You'll Face
The move to CGI in 2015 let the DVSA add clips in adverse weather and low light. Since the 2018 expansion the library has included fog, rain, wind, snow/ice, dusk and night-time scenes, so practise across all of them.
Night driving
Headlight glare, reduced peripheral vision, oncoming dazzle
Rain on the windscreen
Wiper interference, reflections, slower reactions
Fog and low visibility
Hazards emerging late from low-contrast backgrounds
FAQ
FAQ 1What is the pass mark for hazard perception?
44 out of 75 (about 59%). Each of the 15 hazards is worth up to 5 points. You can pass even with a couple of zero-scoring clips, provided your other scores are strong.
FAQ 2Why did I get zero on a clip I clearly saw?
Almost always rhythmic or excessive clicking. The anti-cheat triggers if your click pattern looks like guessing rather than reacting. One click as the hazard starts plus one confirming click is the safest approach.
FAQ 3How many free hazard clips can I practise on?
The DVSA publishes a small free sample on gov.uk. The library Theory Test Pro service includes the full DVSA practice library. YouTube has hundreds of unofficial clips that follow similar patterns.
FAQ 4Are the night and fog clips harder?
Marginally. The pass mark and scoring window are the same as for daytime clips, but the visual cues are subtler. Practise with adverse-weather and low-light clips at least once before booking so they are not a surprise.
FAQ 5Does it matter which mouse I use?
Use whatever you can react quickly with. The DVSA workstation uses a standard wired mouse; if you practise on a laptop trackpad, do at least one full mock with a real mouse before test day.