How Close....

[DYNAGUY]

Does a radar unit have to be to clock your speed on a motorcyle.

 

[glider]

I believe it's line of sight but could be wrong. The instant on units are usually triggered when they see a car approaching as to not give any warning should you be using a detector.

 

[Not Very PC]

It depends on the Radar unit being used, the terrain, and the profile of the bike. The older, 2002 and back radar guns will clock a broadside bike at about 500yds, a head on bike about 200yds.
The newer units will about double that.
The latest ITT laser gun will clock anything the operator can focus the cross-hairs on!!
:bigsmiley21: