The Safer Roads Partnership in West Mercia currently uses three types of speed detection equipment: RADAR and laser.

RADAR speed detection equipment

A device using RADAR technology transmits a radio signal (at a certain frequency) which is then reflected back from the moving vehicle to the device to give a speed reading. It does this by measuring the Doppler shift.

Radar speed detection devices are often fixed at the side of the road but can also be portable.

Laser speed detection equipment

Laser speed detection devices emit a laser beam which is then reflected back from the moving vehicle to the device to give a speed reading. It does this by measuring the time it takes for the beam to be emitted and reflected back.

Laser speed detection devices are operated by an enforcement officer. They are portable and can be operated from either a van, motorbike or from a tripod at the side of the road.

Average speed cameras

Average speed cameras measure the time it takes for a vehicle to travel between a known distance using the ‘distance over time equals speed’ equation.

These types of cameras are often used at roadworks on motorways and will make the calculation using the distance between entry and exit cameras.