Laser Speed Guns
The manufacturers of Laser Speed Guns boast of certain target identification even in heavy traffic conditions. However, independent tests by a NASA scientist in the USA, suggest that Laser Speed Guns are potentially "inaccurate" in identifying the correct target under some conditions. 
Kustom - Pro Laser 3
Kustom - Pro Laser 3
Laser Speed Guns emit a very narrow, intense beam of "invisible" light. The speed of light is a known constant (approximately 300,000 Km per second). Therefore, the laser speed gun calculates distance by measuring the length of time it takes for the beam to travel to a target and back to the gun. Many such readings are taken over a brief period of time to determine how fast a vehicle is traveling. The speed reading "can" be accurate under "ideal" conditions. It is "claimed" that the narrow beam makes target verification more certain than with radar. The Lasers used by enforcement authorities in Australia are made in the USA by Kustom or LTI and operate on a frequency of 904 nanometers. In the states and territories of Australia, Laser Speed Guns have replaced most hand-held radar guns for stationary "point-and-shoot" traps.
Information about Lasers
  • The narrow beam (less than 1 meter at 300 meter from the laser gun) makes target identification more certain than radar under some conditions.
  • It also makes detection by Radar/Laser Detectors very difficult.
  • Halogen car headlights and driving lights reduce the range of the Laser Speed Guns.
  • Refraction errors can produce incorrect speed readings. Because light is refracted differently by hot air than cooler air, a spot of air rising from the roadway can confuse the laser.
  • Laser beams can be affected by atmospheric conditions. Speed reading range is reduced on cloudy or foggy days.
  • When the laser beam bounces off more than one solid object (stationary or moving) reflection errors occur, producing an incorrect speed reading.