Rear camera, which ?

I own a Virb Elite but I'm after a rear facing camera that will interact with my Virb and 810 any idea's ?. I was rear ended by a car 4 years ago and badly injured and I've struggled to keep on the roads with confidence. I did consider the radar but I read they can be too sensitive so I thought they might add to my already high anxiety
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Are any of these bullet cameras around £30 any good ?
The video quality is ok. The boon for me is 1) it's integrated with the light, so only one thing to take on/put on and 2) most people don't know its a camera.
Felt Z6 2012
Red Arthur Caygill steel frame
Tall....
www.seewildlife.co.uk
Although they can be expensive (look for older models on eBay or alike) & the battery life isn't great for image quality & ease of use it's pretty unbeatable.
Won't integrate but for me at least it's price worth paying.
The Garmin Varia Radar is superb although obviously not a camera.