It uses radar behind the rear bumper on each side of the vehicle (same one used for blind spot monitoring). It detects oncoming vehicles from either side and warn you with a chime and a visual alert (it'll blink the blind-spot warning on the mirror on the side the other vehicle is approaching).
It has you wondering - imagine an underground carpark with 250 cars, each of which have a front RADAR and 2 rear radars. Will all the RADARs interact with each other and get confused.
It uses the small radars on the bumper. They are one of the best functioning (and one of my favorite) things about my car. It warns me way before I can see the other car coming.
Ahh, thanks - they seem to call it Autonomous Cruise here - that's what I referred to as front RADAR. I'm not certain, but I assume that City Safe Braking uses the same RADAR. Some more high end cars are advertising that they have high speed and low speed Auto Braking - not sure if that means that they have 2 front RADAR systems? (Subaru, though doesn't use RADAR, but visual systems.)
Possibly but they're millimetre-wave radar so they have shortwave lengths and aren't long range. (well the forward-facing one will be the longest). The forward facing one will have software to ignore cars that are passing by and only focus on objects that are straight ahead. It's typically software driven. The Gen 3 Prius has radar as well but only for cruise control. The amount of brake force applied and the reation time is partially on the hardware (radar quality and the addition of a camera) and software (how fast can it process the data reliably? A camera helps in better recognising the situation so systems with both radar and camera tend to perform better)
