VASCAR

[andybetts]

Hi Guys - Anyone know the accuracy of data received from VASCAR? I've recent read a BiB statement that says two figures for distance and time that don't add up to the speed on a speeding ticket? Surely if these numbers come from a VASCAR Computer they will be 'exactly' correct and not a bit out? Thanks in advance.

[Streetcop]

Hi Andy..
Difficult to say without all the information...

However, the computer on vascar measures the distance and the time taken to get from one point to another and then calcultates the average speed..

Street

[Richard C]

In 1995 in Exeter I successfully fought off a ban brought over a claimed Vascar speed reading of 100.020 mile/h. I managed to get the police trafpol unit to advise that the instrument was manufactured by Meggitt and the manufacturers themselves sent me a data sheet. The data sheet showed that the accuracy of the instrument was +/- 2mile/h. I argued that the speed could not be safely said to be more than 98.02 mile/h.

You could assume that other Vascars are no more and no less accurate but try to find the model.

The vascar readings always state speed to 2 or even 3 places of decimals. Such precision is completely bogus. In the above case it should have been stated as 100 +/- 2mile/h.

[andybetts]

Thanks for the reply SC - So if the statement says the distance was '0.xxx miles' and the time was 'yy.y seconds' then the speed calculation I presume would be exactly correct, to the decimal place. My point is that this is not the case, and the guy is worried that these figures may perhaps have been reverse engineered, because also he wasn't told at the time that VASCAR had been used but that he was being stopped because he had been seen by a laser team some 22 miles away and this particular officer had been dispatched to find him and give him a verbal NIP.