Earlier I saw a post stating that since radar can't track from the side (cosine effect I think) that he did't find the side arrow useful. Just an observation if I may- I find the side arrow very useful especially in situations where the source of the radar can't be seen. All RDs would sound off continuously leaving you wondering where the police was. But with the V1 side arrow, even if I can't see the police, I know when I have passed it and I suppose others would still be wondering when they would be coming up on the source. With the side and rear arrow I have the knowledge when I have passed and when the source is now behind me. No wondering any more. Drive safely and happy motoring.