Sign Illumnation follow on to case. FOI 10206
Case reference FOI2024/00081
Received 15 May 2024
Published 7 June 2024
Request
Response
1.Please confirm reference your answer at point 2 that the illumination sensor which determines if the illumination of the camera sign is switched on is related to light levels only and not visibility.
This is publicly available in the BS EN 12966.
2. Do you have any studies relating light levels to visibility?
“BS EN 12966 Road vertical signs. Variable message traffic signs.” is the reference document for these light levels and National Highways follows these European standards. Manufacturers of VMS then evidence that the signs they provide us comply with this. This document will provide additional answers the customer might want.
3. Please confirm if the case/not the case that the intensity of illumination of the variable speed sign can be adjusted by a sensor which measures light conditions.
Yes, this is the case.
4. Do the variable speed signs and camera sign illuminations have separate light. sensors are they connected by some integrated system.
We can only answer for variable speed signs, but yes, they do indeed have a ambient light monitor in order to best illuminate the sign for the driver based on the environment and time of day.
5. Who do you recognise as the regulator for your camera operated speeding systems?
Speed operated systems are not regulated by any regulated industry.
Documents
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