CAN is content addressed rather than sender/receiver addressed. The address is also used to arbitrate transmit priority on every single message frame. This allo

CAN is content addressed rather than sender/receiver addressed. The address is also used to arbitrate transmit priority on every single message frame. This allows for messages to be sent with well controlled latency, which is important for stuff like drive-by-wire steering and braking. CAN bus wiring isn't floating in that it isn't isolated. The transceivers are required to deal with a large common mode voltage range, though, and there are isolated transceivers for specific use cases. The noise reduction properties are simply that the digital signal is encoded as the difference in voltages between two wires, and those wires are supposed to be twisted together. Also, the typical behavior is for a CAN controller peripheral to automatically re-transmit frames that didn't make it on the bus, for example, if there was too much noise that a receiving node got a CRC mismatch. A video feed from a camera would be way too much bandwidth to run over a typical CAN setup. For reverse cameras, it's probably HDMI or something. For more elaborate safety and convenience systems, it's likely either close enough to the computer that it's a parallel bus, or far enough from the computer that it's a differential high speed interconnect that's qualitatively similar to HDMI.