i live in chicago and when in a construction zone, my V1 goes off when i pass the one area that is being worked on where heavy machinery and trucks are parked. it will go off maybe a 1/4 mile before these areas. its always 1-4 dots on the strength meter and usually X band. most times i will get 2 bogeys. i know for sure there are no radar cameras or signs and its definitely not police. do construction workers use some equipment that utilizes radar?