HOW DOES PEDESTRIAN AND CYCLIST DETECTION WORK?
A pedestrian safety system is disclosed herein. The pedestrian safety system includes a vehicle crossing arm system, an alarm annunciator, a plurality of sensors and an in-vehicle display device. In one embodiment, the vehicle crossing arm system may include a crossing arm and a crossing arm motor.
The pedestrian safety system may be useful for improving the ability to detect movement of pedestrians in proximity to a vehicle. In particular, for detecting movement of children in proximity to a school bus.
Until recently, vehicle-mounted radar sensors and miniature cameras have mostly focused on the relatively simple task of monitoring the position and speed of large, solid objects in front of a vehicle (ie: other cars and trucks). Now automakers are offering pedestrian and cyclist detection and collision avoidance systems designed to track much smaller — and more complex — moving objects in a car’s path, warning the driver and applying the brakes if necessary.
The radars and sensors play different roles, but they both need to confirm the object in order for the system to take action: The radar detects objects and tracks the vehicle’s distance to them, taking the vehicle’s speed into account, while the high-resolution camera determines the type of object based on its movement pattern, height and size.
Despite advances, there are still limitations: The radar and sensor face forward, so they cannot detect bicyclists traveling directly beside or behind the vehicle (in most instances the blind spot warning system will do that), and the bicycle itself needs to be adult-sized and feature a rear reflector. If those requirements aren’t fulfulled, the system will still track the bicyclist and react as if it was a pedestrian. Another limitation is difficulty identifying either obstacle in low light or at night.
Benefits of pedestrian detection system
A 2012 study by the Insurance Institute for Highway Safety examined how particular features of crash-avoidance systems affected the number of claims under various forms of insurance coverage. The findings indicate that two crash-avoidance features provide the biggest benefits: autonomous braking that would brake on its own, if the driver does not, to avoid a forward collision, and adaptive headlights that would shift the headlights in the direction the driver steers. They found lane departure systems to be not helpful, and perhaps harmful, at the circa 2012 stage of development. A 2015 Insurance Institute for Highway Safety study found forward collision warning and automatic braking systems reduced rear collisions. In the 2016 Berlin terror attack a truck was driven into the Berlin Christmas market and was brought to a stop by its automatic braking system Collision avoidance features are rapidly making their way into the new vehicle fleet. In a study of police-reported crashes, automatic emergency braking was found to reduce the incidence of rear-end crashes by 39 percent. A 2012 study suggests that if all cars feature the system, it will reduce accidents by up to 27 percent and save up to 8,000 lives per year on European roads.