Safe Speed Forums

When the speed camera aquires the distance to a car it prints it on to the video. Has any one got a technical data sheet or similar which states what the time lag is between the acquisition of this distance and it being displayed. With this information I can work out exactly where my car was at the time of the speed reading.
Steve c

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help Dr L i have been band from driving for six months i was not speeding the LTi 20/20 was not being used in line with ACPO this was proved, high probability of speed reading affected by reflection from other vehicle have video need to prove speed

Unfortunately, I have no document stating the lag. I would assume the lag from the gun from ending the measurement to the reading being displayed is quite short, finger in the air I would guess within 0.1 sec.
The measurement period itself is 0.32s.
IIRC the calculated distance is the average taken through the measurement period, so the calculated distance would end up being halfway through the measurement (0.16s).

The TTl 20 20 speed camera if used in accordance with the law is to co-oberate an officers opinion that a motorist is speeding. Now if they are simply zapping everthing that moves, in other words they are not looking at vehicles assertaining that they are speeding then targeting them with the speedscope to measure their speed, they are simply targeting the vehicle with the speed scope and zap. All this is clearly wrong. Now I have calculated that the officer in question took 1.27 seconds to assertain my speed and aim the speed scope at my car and measure my speed. Must be wrong. Has anyone got any scientific data on how long it should reasonably take to select a target assess it and aim a speedscope at it.

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help Dr L i have been band from driving for six months i was not speeding the LTi 20/20 was not being used in line with ACPO this was proved, high probability of speed reading affected by reflection from other vehicle have video need to prove speed

on what sort of road were you caught, were you approaching the camera or going past it, from talking to the operators of the vans up here they do get assessed