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Not having used a rear facing radar on my bike, a few questions:
What size vehicles do these detect? I'm guessing they detect cars and trucks, but what about motorcycles and other cyclists?
If you are riding toward the front of a paceline, do the bicycles behind you interfere with detecting motor vehicles approaching from behind? What about when riding in a multiple line group (such as a group riding in a line two abreast)?
What angle of view do they have? Will they detect approaching vehicles in tight curves?
If there are multiple cars approaching from behind, say 100m or less apart, does the radar beep or flash continuously? In which case, is the radar useful when riding in city traffic?
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