This document discusses speed cameras and how they work to enforce speed limits. It describes how speed cameras use technologies like piezo sensors, radar guns, and infrared sensors to detect if vehicles are speeding. When a vehicle exceeds the speed limit, the camera takes a digital image that records the vehicle's speed, time, and license plate number. The document also outlines some benefits of speed cameras, like reducing accidents and saving lives, as well as some criticisms that they are just a tax on wealthy drivers or that speed is not the main cause of accidents.

1. speed limit enforcement came
DONE BY-
Priya Subramani
Saranathan college of Engineering,
Trichy.

2. ROAD ACCIDENTS

3. SPEED CAMERAS:
Speed camera is a device that
assists whether the vehicles are
travelling in a constant speed or
not.
If a vehicle exceeds the speed
limit, a digital image of the vehicle
is recorded.
It records the speed, time and
even recognizes the vehicle’s
number plate.

4. Some of the Speed Cameras …..

5. VARIOUS TECHNOLOGIES EMPLOYED IN THE
WORKING OF SPEED CAMERAS
4.Radar speed guns: (doppler effect)
2.LIDAR speed guns-(laser pulses)
3.Infra red light sensors
1.Piezo sensors

6. PIEZO SENSORS:
Principle- Piezoelectric effect.
These are embedded on the surface of road at a fixed
distance .
 The distance between them can be set to any desired
value.

7. WORKING OF PIEZO SENSORS

8. CAPTURING OF VEHICLES
IMAGE
If the velocity of crossed vehicle is more than the
desired speed, then a digital image of the vehicle is
taken in the speed camera.

9. TYPES OF SPEED CAMERAS

10. APPLICATIONS:
1.SPEED CAMERA IN
MULTILANE SYSTEM
 Speed cameras can monitor
one to four lanes in the same
direction.
 This is achieved by the
installation of piezo detectors in
each lane.

11. 2.SPEED CAMERA IN HEAVY
TRAFFIC
 Speeding vehicle can be detected and photographed even
in heavy traffic.
 The angle at which the cameras are set enables pictures to
be taken even if another vehicle is in close proximity.

12. BENEFITS OF SPEED CAMERAS
 Speed costs Lives
Economic Benefit
Good for environment
CRITICISM OF SPEED CAMERA
Speed is not the main cause of death
 Speed camera are a tax on rich.

13. CONCLUSION:
Speed cameras are the modern
innovations which guides whether the
vehicles are engaged in a average speed.
It is a new approach to extract the
vehicle details like time, speed etc.
Hence, the speed camera system must
be implemented throughout the country,
so that the percentage of accidents
would be reduced to greater extent.