Key legal question
Whether a 3 km/h or 5 km/h safety margin had to be deducted from the measured speed recorded by a fixed laser device.
Extracted holding
The cantonal court was not arbitrary in deducting 3 km/h; for a fixed laser cinemometer, the applicable margin could be taken from the laser-specific instructions.
Extracted reasoning
The device was a permanently installed laser instrument, and the approval documents referred to the laser-specific margin in the instructions. The reference in the instructions for permanently installed devices to 5 km/h concerns radar-type devices, not laser devices.