LASER SPEED GUN - potentially unreliable and inaccurate.

**ghosthunter** · March 16th, 2012 06:17 PM

These videos will make you wonder how accurate the MMDA's laser speed guns that are currently being used along Commonwealth and Macapagal Ave and the ones also being used along SLEX and the SKYWAY as well. Another potential abuse by the MMDA that would be difficult to disprove?

A UK television show casts serious doubt over the reliability of speed measurements taken using the widely-used LTI 20-20 LIDAR (LASER) speed gun. A leading expert in the field of LASER distance and speed measurement throws a spanner into the Government spin machine that tells us these devices are infallible. I wonder how many prosecutions have been brought about and subsequent lives ruined through loss of jobs etc based on readings that were simply not correct...?

The BBC Inside Out documented the inaccuracy of the LTI 20/20 on how the 'slip effect' can add up to 30MPH to the recorded speed.

I get a speed reading off the side of a building which isn't moving. This video goes to show what is know as "Slip effect" where the panning or moving of the laser gun's beam along the side of an object a speed reading can be obtained whether the object is moving or not. This video shows mainly shows how I can get a speed reading off an object that isn't moving

**Bin Diesel** · March 16th, 2012 08:23 PM

Actually yan talaga ang pinaka concern ko sa mga speed guns na yan. Syempre lahat ng measurement device may tolerance sa accuracy. Kapag nahuli tayo pede na natin i-contest.

**ghosthunter** · March 16th, 2012 09:28 PM

Originally Posted by Bin Diesel

Actually yan talaga ang pinaka concern ko sa mga speed guns na yan. Syempre lahat ng measurement device may tolerance sa accuracy. Kapag nahuli tayo pede na natin i-contest.

The speed gun itself is accurate. The problem is when it is used by the operator. It's the operator's movements (even the smallest) that can cause inaccuracies in measurement. Can you imagine how big the movement of a twitchy hand when magnified by a distance of 1000 meters? Then add to the fact that the target is moving at 60kph and you have to keep the speed gun aimed at a single point on the target.