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theory test
Hazard perception test
Hazard perception test introduction
Hazard perception test forms a second section of the theory test and must be passed at the same time.
Integrating theoretical hazard perception test training into the practical training sessions will ensure that as competence is achieved in each of the necessary skills, they can be strengthened and applied while you are on the road to increase the road safety benefits.
This part of the theory test requires you to view 14 hazard video clips on the computer screen of approximately one minute each. You are required to watch these clips as if you were the driver. There will be 15 hazard to find - at least one on each clip. However, one clip will have 2 hazard. The hazard perception test clips will not contain any sound.
The clips feature various types of hazard, such as vehicles, pedestrians and road conditions. You should respond by pressing a mouse button as soon as you see a hazard developing that may result in the driver having to take some action, such as changing speed or direction. The earlier the developing hazard is spotted, and a response made, the higher the score.
Candidates can score up to five marks on each hazard and the test contains 15 score able hazard.
You click either the left or right mouse button whenever you think you can see a hazard developing. The speed at which you click the mouse button as a hazard develops will determine your score for that particular hazard perception clips. You can score between 0 and 5 on each hazard.
The pass mark for this part of the test is 44 out of 75 (i.e. 15 hazard x 5) for car drivers and motorcycle riders.
Those taking LGV or PCV (lorry or bus) tests must score at least 50 out of 75.
Candidates are given their results when they have finished both parts of the test and have returned to the waiting room.
Hazard perception test examination process
Each hazard perception clip will start with a freeze frame of the start of the video sequence and a count down from 10 will commence. At the end of the count down the clip will start to play and you will be required to click the mouse button each time you see a developing hazard.
To let you know that the program has registered your click a red flag will appear on a grey band across the bottom of the screen - one flag for each click you make in any particular clip. At the end of the clip all the flags will be removed before you start the next clip.
As an example, of how to identify and respond to a developing hazard, consider a parked vehicle on the side of the road. When you first see it, it is not doing anything; it is just a parked vehicle. If you were to respond to the vehicle at this point, you would not score any marks, but you would not lose any marks.
However, when you get closer to the vehicle, you notice that the car's right hand indicator starts to flash. The indicator would lead you to believe that the driver of the vehicle has an intention of moving away, therefore the hazard is now developing and a response at this point would score marks. The indicator coming on is a sign that the parked vehicle has changed its status from a potential hazard into a developing hazard.
When you get closer to the vehicle, you will probably see the vehicle start to move away from the side of the road; another response should be made at this point. Different clips in the test will have various signs to indicate that the hazard is changing its status and is now starting to develop.
How the scoring mechanism works ?
Each scoring window is divided into five equal segments and a score of five through to one allocated to each. Those responding in the first segment of the scoring window will score 5 and those in last segment a score of 1. Responses outside the window will score zero.
If you click the mouse while in the first segment (i.e. just as the developing hazard appears) you will obtain the maximum score of 5 points. If you click in the second segment of this window of time you will score 4 points, then 3, then 2 and then in the last segment just 1. This is accurate to one twenty fifth of a second.
If you click the mouse button (this is how you inform the computer that you have seen a hazard) too early, before the potential hazard becomes what the DSA term a developing hazard. Your score will be 0. Therefore to ensure you get a maximum score in the hazard perception test challenge, you should fully understand the DSA term developing hazard as opposed to potential hazard
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