How do Road Safety Cameras Work?

Red-Light Safety Cameras

  • The system activates when motion is detected just prior to the designated stop bar AFTER the traffic signal has turned red. The stop bar is the point where the intersection technically begins, often designated by a thick white line. When motion is detected, the Red-Light Safety Camera captures two images of an alleged violation, taken from the rear of the vehicle.
  • The first image shows the violating vehicle in front of the designated stop bar and the illuminated red light, demonstrating that the vehicle had not entered the intersection before the light changed.
  • The second image shows the violator in the middle of the intersection with the red light illuminated, providing further evidence of the red-light violation.
  • A close-up of the violating vehicle’s license plate obtained from one of these two high-resolution images is used to verify the vehicle’s owner as well as additional evidence.
  • The system also records multiple violation data, including the time, date and durations of the yellow and red lights.
  • The camera also records a 12-second digital video of the violation that includes six seconds prior to and six seconds after the violating vehicle runs the red light.
  • For states that require identification of the driver, an image of the front of the vehicle, displaying the driver’s face, is captured as well.
  • Trained law enforcement officials must review and approve all potential red-light running violations before citations can be issued. These officials closely examine the images, video and violation data to determine whether a violation did in fact occur.

Speed Safety Cameras

  • There are multiple ways Speed Safety Cameras can capture violating vehicles: A speeding vehicle can be detected by sensors embedded in the road just before the speed-enforcement zone or by passing through radar or laser beams that span across the road.
  • If a vehicle meets or exceeds the speed criteria established by the municipality, the system’s camera captures two images: one at the initial point of speed detection and a second confirmation image based on a fixed distance calculation.
  • With each image, the system records relevant violation data such as the location, date, time (in tenths of seconds), speed and posted speed.
  • The system also records a 12-second digital video of the violation.
  • As with red-light running violations, trained law enforcement official must review all captured evidence of a potential speeding violation and approve the violation before citations are issued.

Crossing Guard School Bus Stop Arm Safety Cameras

  • Video cameras are installed on the exterior of the driver’s side of the school bus.
  • When a school bus extends its Stop Arm and turns on its flashing lights, the system will automatically detect if a vehicle passes the stopped school bus within the enforcement zone.
  • If a vehicle passes the school bus, the cameras capture video of the back of the violating vehicle.
  • Violation videos are wirelessly uploaded to ATS’ Axsis™ Violation Processing System for validation, processing and notice issuance.
  • A violation image is extracted from the video; this image will show the violating vehicle as it passes the school bus, the violating vehicle’s license plate and the school bus’ extended stop arm.
  • A final review of the violation image and video is conducted by law enforcement personnel, who then will approve or reject the violation.
  • If the violation is approved, a citation then is issued to the owner of the violating vehicle.
February 25th, 2015|