Was it that he did not see the sign or did he not slow down to 30 mph? If he was speeding, but regardless of the signage, it is an offence of strict liability and an automatic fail.
This might seem a very odd question, particularly as the test was in daylight, but is there any street lighting?
The reason I ask is that if there is a system of street lighting, the presence of the signage is actually not relevant and the driver is supposed to know that if there is a system of street lighting and no repeater signs, that the speed limit is 30 mph.
However, the fact remains that drivers do rely on speed limit signs to regulate the speed. I agree with you that it’s unfair and it would certainly not prevent me making a complaint. However I don’t think you’re going to have the positive result that you are hoping for.
Sorry, I wish I could give you a more favourable answer.
Can I clarify anything for you?
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Thank you. In which case, the reason for failure would probably be that he didn’t keep pace with traffic conditions.
I think you have more chance of making a complaint about the failure to increase speed than the other way round.
Make sure that you go out now and take lots of photographs which you can send with the complaint.
You need to show that it really is obscured you also need to show that there are no repeater signs further on and that there is no sign on the other side of the road. All of that, if it exists, is likely to be fatal to the complaint.