How do speed cameras work?

Answer 1

There are several different designs and systems depending on the manufacturer of the device, but a basic type operates by timer. Once the light turns red it activates the camera mechanism and anything that passes through the camera's field of view triggers the camera to take a picture. Other more sophislticated types work on the same principle as radar. When a vehicle crosses its field of view after the light turns red, it triggers the camera.

Answer 2

A small radar unit constantly checks the speed of vehicles and, under computer control, decides if a vehicle is going too fast. If so, the computer activates the camera. Bingo, one offender nailed.

Answer 3

gatso is a type of camera that uses radar technology to catch vehicles speeding There are over 4,000 fixed Gatso speed cameras currently in use by police forces and local authorities across the UK, accounting for 90% of all fixed speed cameras. The Gatso which uses radar technology, is used for fixed speed cameras, in-car mobile units, on tripods and can even be used from moving vehicles. Fixed Gatso speed cameras are rear facing. This is so the cameras 'flash' does not blind oncoming motorists. Unfortunately, this also means the cameras are not always viewable until the last second (as pictured above). The cost of installing a Gatso speed camera is approximately £20,000, but can cost as much as £40,000 if located in a rural location, as the system requires a 240v power supply.

The fixed Gatso camera has the ability to take up to 400 pictures. Cameras in that are located in busy areas or are particularly hidden, often only last a few hours before the film runs out, soon recouping the £20,000-£40,000 price tag.

Gatso speed cameras can also identify between cars/vans and HGVs separately. For example, if the speed limit was 60mph for cars/vans and 40mph for HGVs the camera will enforce the two separate limits.

It is common for fixed Gatsos to be positioned so they can be turned around to check both sides of the road - but only one direction at a time.

On the M25 in Berkshire and Surrey Gatso speed cameras have been placed in gantries across the width of the motorway with all four lanes covered simultaneously.

Points and Penalties

Being prosecuted in the UK by a Gatso speed camera can result in a minimum of 3 penalty points and a £60 fine. Fine amounts are currently under review by the government and may increase in near future.

Gatso speed cameras use radar technology and as they can be used as fixed speed cameras, fixed upon tripods, used inside moving police vehicles and in-car mobile police units, they are extremely convenient for local authorities and police forces across the UK. Because of this, they account for 90% of our fixed speed cameras. Costing approximately £20,000 per camera - or £40,000 in rural locations due to the need for a 240v power supply, the fixed Gatso cameras can take up to 400 pictures before the film runs out, and are rear-facing. They are designed this way so that when the camera flashes at a speeding motorist, it doesn't blind them and cause an accident. However this means that you often don't see a Gatso camera until the very last minute- which makes sure that the camera pays for itself relatively quickly. Often you'll find two Gatso's pointing in opposite directions, to catch motorists travelling either way. Annoyingly, they are clever little machines which can distinguish between different sizes of vehicles and can also enforce separate speeding limits - e.g. on roads where cars and vans are allowed to drive at 60mph, but HGVs are restricted to 40mph, it will be able to tell which is which, and enforce the limits accordingly. Calculation You need the following pieces of information:

Number of marks passed

Interval between photos in seconds

Distance between marks in feet

You can calculate speed in mph as follows: Speed = Gap * Marks * 0.6818 / Interval Example: Suppose the vehicle passed 7 marks 5 feet apart in 0.5 seconds. Calculate as follows: 7 marks * 5 feet * 0.6818 / 0.5 seconds = 47.7 mph You may need the following conversion factors: Mph to feet per second: multiply by 1.46667

Feet per second to mph: multiply by 0.6818

Feet to metres: multiply by 0.3048

Metres to feet: multiply by 3.2808

Answer 4

They measure motorists speed and if they are exceeding the speed limit, they are photographed (currently from behind) giving the authorities your vehicle registration mark. Firstly, they have to measure your speed. This bit can be done in two ways. One way, by using piezo-electric strips embedded in the road; two such strips at a known distance apart will detect your wheels over them. The time it takes between the two strips gives the speed. (Speed equals distance divided by time.) Another way is to use radar. By emitting suitably high-frequency radio waves, they can bounce these from the vehicle, and the rate-of-change of distance is detected by a frequency shift from the reflection. If this rate-of-change is higher than the rate-of-change for the speed limit, you're caught. Next, they have to photograph the vehicle. This bit sounds easy but is not so straight-forward. The photographs taken will be both normal and infra-red. (The infra-red will 'see' your registration mark when the vehicle is caked in dirt.) Also, to collect the proof, two photographs are taken in quick succession, so that the distance travelled can be seen. Obviously the "quick succession" is a known time: Again speed can be calculated. To determine the distance, white square marks are usually painted in the gutter of the road and again on the crown of the road. These are a known distance and the two photographs will show the distance travelled.

But, gatsos can very easily be stopped. Burning them works, as does filling them with expandable foam. That isn't the voice of experience, merely observation.

Answer 5

Takes a picture of you and the license plate. They will mail the ticket to the owner of the vehicle and if the owner was not driving at time time of offense they can fill in who was driving and the court will then mail the ticket to that person.

Answer 6

speed cameras are triggered when the oject that focused on moves at a faster speed than set on the input in to it red light cameras are trigered (the big box ones on side of road) by a strip in the road funny i saw kid riding bike on strips fast and the red light camera kept flashing

Answer 7

gosto cameras are activated as the vehicle crosses a radar beam and it takes two photographs half a second apart whereas truvelo speed cameras are activated as the vehicle over sensors in the road on board computers instantly calculate the distance travelled between the two points

Answer 8

Radio waves are the secret to the camera's working. Nothing can defeat the speed of light. It is always shooting radio waves at the point its meant to. If the radio waves reflect back to it much quicker then its meant to then it quickly captures the picture of the car along with its number plates. Then it processes the image and sends it to the authorities. Now this process starts when the traffic light goes red.

Answer 9

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