Background Information - Blackspot Interactive Road Angel User Manual

Background Information

Global Positioning Satellites (GPS)
Operational since 1990, 24 satellites orbit the earth at a height of
11,000 miles. At any given point on the globe, at least 4 satellites are
in view at any one time. Using sophisticated aerials and triangulation
techniques, units such as ROAD ANGEL are able to compute your
exact position with great accuracy.
Speed cameras and blackspots
The 5 main danger zones are:
Gatso –
Truvelo –
SPECS –
Mobile Laser – Hand-held devices that record your speed in
Blackspot –
17
Measure your speed and photograph the rear of
your vehicle.
Measure your speed and photograph the front of
the vehicle along with driver.
Measure your average speed between two points
and photograph the front of the vehicle.
either direction.
A specific location where a high number of
accidents have occurred e.g. a difficult junction.