Average Speed Cameras

[jd_here]

I regularly travel along a stretch of road, about 8 miles, which is covered by ASC's. There are two cameras approximately a mile apart, then there is a 30 mph restriction through a village, and then there are 2 more ASC's, again about a mile apart. Question, are these two separate areas covered by the cameras or, if you travel the full 8 miles, do the cameras take into consideration the 30 mph restriction? TIA, JD

[Buenchico]

ASCs pass the information from the first camera to the second, from the second to the third, and so on. That way, the average speed of each section of the road is monitored separately.

Numbering the cameras along your route as 1 to 4, in order, and assuming that cameras 2 and 3 are positioned at the two ends of the 30 mph limit:
Cameras 1 and 2 will combine together to check your average speed over the first (rural) stretch of the road.
Cameras 2 and 3 work together to check your average speed in the 30mph zone.
Cameras 3 and 4 are used to check your average speed in the second rural stretch.

If Cameras 2 and 3 are not located at the start and end of the 30mph stretch, there must only be two separate lengths of road which are monitored. i.e. between Cameras 1 and 2 and between Cameras 3 and 4. I can't think of any circumstances where Cameras 1 and 4 would work together (as suggested in your post).

Chris

[buildersmate]

Don't understand Chris.
Why can't camera 2 and 3 be linked, even though the average speed through the section is a combination of 2 different speed limited sections.
It merely requires the minimum time for a vehicle passing between the cameras 2 and 3 to be calculated during positioning and set-up. It is elapsed time that these things measure.

[Panic Button]

I understood Chris perfectly, but buildersmate has lost me.

[kempie]

If the stretch of road between cameras 2 and 3 includes more than one speed zone it would be impossible to prove which of the speed limits was exceeded.

e.g. if a 30 mph zone and 50 mph zone exist would the resulting charge be exceeding the 30 or 50?
...and by how much was the limit exceeded?

A successful prosecution would require a less ambiguous charge than could be offered in those circumstances.