Leisesturm

Sorry, you are wasting your time. No one believes you. Next time try NOT telling the world what you DON'T want them to do in your thread. Reverse psychology. What a concept. And in case you've forgotten, mirrors came up frequently in this thread, long before I chimed in. It was inevitable.

diabloridr

May not be helpful for avoiding a collision, but good chance it can record vehicle type, color, and license plate if one occurs.

Leisesturm

Actually, the large majority of car bike collisions are with the car striking the bicycle side on, or with the bicycle striking the car side on. A T-Bone in the common vernacular. The greater amount of information a camera can record vs. eyewitness testimony is minimal. Might be worth it if cameras were free, given out for nothing with every bike purchase. But they are not. I'll put the money saved towards ... something else. Anything else.

rsay

We have the rearview radar, mirrors, a high level of suspicion, a stoker with excellent hearing, good rotational flexibility of our necks, reliable riding buddies and some disposable income that we use for our cycling. Prior to the radar, we would have maybe 1 car sneak up on us per hundred miles of riding. Somewhere around a 99-99.5% detection rate that further improves at least an order of magnitude near intersections or hazardous areas. Even though it didn't happen often, it always left me with a weird chill when a car surprised me. Our simple question was: "Is it worth $200 to pick up one additional car per hundred miles of riding?". Our answer was clearly yes since we made the purchase. We have yet to experience the vehicle that slipped through all of our layers undetected since we got the radar, though we know it will eventually happen. The radar often works better than our mirrors and ears from the middle of a group, which was an unexpected bonus. We are willing to forego one future fine dining experience(or one must-have lightweight cycling component upgrade) in favor of a "marginal gain" in safety on the road. If you have never experienced that uncomfortable sensation of having an automobile come alongside that you were unaware of, rearview radar is of no potential benefit to you. I do apologize because I will still call out " Car back!" on group rides even though you will already know it's there.

MikeAndJean

We mounted a rear-facing GoPro under the stoker's seat on our tandem. This isn't an attempt at an electronic rear-view mirror. We just don't want our daughter to be stuck with paying for the double funeral. For real-time information about what is following you, there is no substitute for good hearing, peripheral vision, and a flexible neck.