Having a rear radar in a tight road network like Hong Kong has been amazing

I have had a few false positives due to parallel roads and such, but I don't consider that an issue.

This wouldn't do much good if you're on a bumpy descent, but on a smooth road at high speed it's a great warning

The Edge still displays the RTL 510 icon, with no indication of any problem, but does not display any oncoming traffic, as if the road was clear