robmcla wrote: Also the use is also not correct because she used it from a flat surface catching cars moving down the hill not directly towards the gun as it is meant to be used. This violates the manual as stating the cosine angle should never be more than 15 feet from the road edge. My arguement is that a vehicle more the 15 feet above the instrument is the same. Also when shooting in this method the cosine angle has never been tested by the manufacturer. This is just more information for site users to think about when they get nabbed using a laser gun.
What are you thoughts on this defence as well.
What manual are you reading?
Canada has not used imperial for speed since 1977. The manuals we have are not in MPH or even feet.
I also found a British/UK version of the manual for the mentioned unit.....and it reads...
"A good rule of thumb is not to exceed 1 metre off the road for every 10 metres shooting down range to the targets. If you want to target vehicles 150 metres down the road, for example, setup no more than 15 metres off the road. Remember that the cosine effect is always in the drivers favour."
The manual does have the cosine testing in it, with the actual affects on speeds at various angles....
at 3 metres away from road, 300m is .9999, 600m is 1.000
at 10metres away from road, 300m is .9997, 600m is .9999
at 15metres away from road, 300m is .9987, 600m is .9997
so how does this affect things....a vehicle travelling 80km/hr (if one could stand directly in front of car, and ensure lidar is level with licence plate)
....even if the lidar operator is 15m (49.21ft) away from road the speed at:
300m would be 79.896km/hr and shown on lidar at 79km/hr
600m would be 79.976km/hr and shown on lidar at 79km/hr.
The driver therefore gets 2 reductions in speed, one by the cosine itself and the second in the unit rounding down.