T&L Publications

They have kits and whole Radar units using ultra sonics. Start there. ------------------- Thanks, but where? Where do I look for such things? I might add that this is not my first posting on the subject. I have tried electronics firms, and bicycle accessory websites, etc. I have tried stores, manuf...

I'm looking for a device that I can mount on the back of my bicycle for the purpose of alerting me of bicycles approaching from the rear. The device would have to be battery operated, and I would want it to be able to detect bicycles from 20 to 30 feet behind me. What else? Well, I wouldn't want to ...