if they were under a bridge behind bushes and you were going past them at 90KMH's then fanged it.... how can they catch you with the radar?? There is a range//radius where the radar can go up to and by the sounds of it you were past them by quite a bit?
I have heard of a case where somoene had been pulled over doing 170 in a 60 zone and there was a highway patrol at a set of lights at the intersection.. the person flew past them and the pursuit was on, The person eventually got pulled over and the police officer had said he was travelling at a distinctive speed and had been caught on the radar... The person had protested and said he was doing the speed limit and asked to see the reading on the radar.... Police officer had NOTHING on him and let him go
If they cant prove it they got nothing on ya.....