Clark, Michael Alexander Graham
HKSAR v Alexander Au Pak Cheung
HK Court of First Instance, 22-Jun-2015
Mr Au's conviction is quashed, on a successful challenge to the reliability of LiDAR speed guns due to possible panning errors. The expert defence witness was probably Dr Michael Clark of the UK. We note that at a distance of 131.7 metres as measured, if you are aiming at a registration plate that is 30cm off the ground, a 0.13 degree shift is enough to hit the ground instead. LiDAR doesn't actually measure speed - it measures distance at time intervals, so if you pan the target then you can get a false reading. Incidentally, Mr Au is also a racing driver in the Audi R8 LMS Cup.
HK Court of First Instance, 22-Jun-2015
Mr Au's conviction is quashed, on a successful challenge to the reliability of LiDAR speed guns due to possible panning errors. The expert defence witness was probably Dr Michael Clark of the UK. We note that at a distance of 131.7 metres as measured, if you are aiming at a registration plate that is 30cm off the ground, a 0.13 degree shift is enough to hit the ground instead. LiDAR doesn't actually measure speed - it measures distance at time intervals, so if you pan the target then you can get a false reading. Incidentally, Mr Au is also a racing driver in the Audi R8 LMS Cup.
Sign up for our free newsletter
Recommend Webb-site to a friend
Copyright & disclaimer, Privacy policy