interesting subject.
 i went to an open day orginised by a local Raf air field and eveybody was able to do a sprint down the airstrip, the Mpīs were unable to get a fix on the small frontal area of a motorcycle and had to call the speed reading off. but im not sure which equipment they were using (didnīt want to ask too many questions 

) 
 second point - i hate the fact in the UK you only see the photo evidence in court!
 over here you get a great little pic every time just so you can see how stupid you look when driving a car