Expert Fitting Service

TruVelo DS2, Portable Autovision 2 & Speedmaster.

Speedmaster DS2.    Copyright © Steve Warren.

Speedmaster DS2 Strip.    Copyright © Steve Warren.

Above: Ford Escort Van used for the task of hiding the Autovision System,
in this case the system was on the pavement. Note The orange light on the van not blue,
and from the back of this van it just looked like a breakdown vehicle,
from the side it has police on it.

DS2 (TruVelo) is a portable attended or unattended trap using a set of three rubber hoses and at one end are Piezo-electric Sensors, being either permanent which are hard to spot, or a moveable system which is easier to spot. Look for the three strips 1 metre apart on the tarmac, at the permanent sites look for the small grey pillar about two foot high. These sites can be linked to Portable Autovision or Autovision 2 allowing the Police to gather video evidence and sometimes these sites will be left unattended.

Autovision (See bottom of page for picture) is the system you see on Police, Camera, Action for obtaining Video evidence, being a portable video camera or a fixed camera inside the Police car, they can hock this up to most speed trap equipment including VASCAR 5000, If connected to Speedmaster it can nab five vehicles a second.

Speedmaster very much the same as DS2, it is a portable attended or unattended trap using a set of three rubber hoses and at one end are Piezo-electric Sensors. Usually sited in set locations where the local council and Police have decided to put them, they bury them in the road, and the only give-away can be a small Grey box by the side of the road or looking for the three strips. This system can be linked up to Autovision for video evidence as well.

Auto Vision & Speedmaster Strip & Road Side Box, insert is with the cable reel fitted.    Copyright © Steve Warren. Typical Boot Equipment for Auto Vision & Speedmaster, Case on the left is the Speed Calculating computer & on the right is the Video Recording Unit.    Copyright © Steve Warren.

Left: Roadside post and cable real to link up to control unit,
in the background you can see the Piezo Strips
Right: Inside boot are two cases, first one is the speed measuring equipment,
second one is the video unit, the camera can be seen
just to the side of the rear view mirror.

Auto Vision Car, boot would not normally be open, the car or van is placed about 25 yards from the strips, looking back at them.

Above: Unmarked Ford Escort Estate used for
the task of hiding the Autovision System.

How they Work

The strips or hose are a known distance apart, and the time between compression's is measured to give the resulting speed of the vehicle. The system takes two readings on a two-axle vehicle and uses the average time for compression's to calculate the resulting speed. Because there are three strips, it can measure the speed of vehicles travelling in either direction by comparing which strip was compressed first. Don't mistake these for the system that the DoT use to do road-usage statistics (counting the number of vehicles etc.), these units have either one or two rubber hoses across the road or inductive loops that cross the hole road.

DS2 (TruVelo) and Speedmaster 2 systems are usually always accompanied by Police officers, either in the bushes or sat in a car. One officer may be in another car or standing up the road talking to the officer taking the reading by a radio link, he will then pull over the offending vehicle. The system is very portable and only tends to be used on two lane roads.

Autovision being the camera based system can be left unattended just like a Gatso, the camera is usually always sited in an unmarked vehicle.

Autovision is becoming very popular because they can use one system in many places, the cost of placing the strips in the tarmac is low, compared to siting a Gatso Camera, and the police can hook up in a few minutes to the loops via the road side box, they then video offenders and move on to another site.
Often the roads covered have signs saying "Mobile Speed Cameras" and these strips are now in a lot of places. Look for the tell tail Grey Post by the side of the road and the three strips next to the post, they are quite often sited in a position where a police car can park safely down from them like a lay-by. They have been seen on the M1 in Northamptonshire near Jun 16 with the strips in lane 3 so watch out.

Above: Unmarked ford in Scotland using pre installed
road strips and a lay-by so as not to stand out



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