Vehicle and Traffic (Offence Detection Devices) Regulations 2023
14Calculation of average speed-limit of section of road between detection points
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14 Calculation of average speed-limit of section of road between detection points
(1) For the purposes of section 56DA(3)(b)(ii) of the Act, if more than one speed-limit applies to a driver on a length of road between two detection points, the average speed-limit between those detection points is to be calculated using the following formula and expressed in kilometres per hour, rounded up to the next whole number:
[](/image/ODD average speed limit.gif)
where –
AS is the sum of "D" divided by "S" that is calculated for each speed-limited part of "BP";
BP is the total shortest practicable distance, between two detection points on the road, expressed in metres and rounded down to the next whole number;
D for a speed-limited part of the length of road, is the shortest practicable distance between the start and end of the part of the road on which that limit applies, expressed in metres and rounded down to the next whole number;
S for a speed-limited part of the length of the road, is the speed-limit applying to a driver for that part of the road, expressed in kilometres per hour;
speed-limited part, of a length of road between two detection points, is a part of the road on which a particular speed-limit applies to a driver.
(2) If it is not practicable to calculate the average speed-limit in accordance with subregulation (1) , then the highest speed-limit applying to a driver for any section of the road is to be taken as the speed-limit for the entire length of road between the detection points.