If he was parked on an angle to the direction of traffic he is likley adding speed because of the cosign error. This would drop the speed indicated on the gun lower than the actual speed of the target because you are not driving directly toward the gun.

There has been construction going on for some time now but it is completed as far as McCowen. This road used to start off from 48 as a 60k limit then quickly became an 80 but during construction the white and black signs were changed to 60 and the orange ones were lower while the road was being work...

This might help, just enter the area, day and time.
http://www.climate.weatheroffice.gc.ca/ ... dex_e.html

Approx 9pm during the week mostly east of the 400 OPP siting at Cardinal Golf club or moving. limit 80k. Also have seen them on occasion in the industrial area east of Schomberg around the same time.