SAE J845:2019 pdf free

SAE J845:2019 pdf free.Optical Warning Devices for Authorized Emergency, Maintenance, and Service Vehicles
An optical warning device that projects light in a horizontal 360-degree arc and vertically from 5 degrees up to 5 degrees down. It will project flashes of light to an observer positioned at a fixed location within the arc of coverage. This would include all 360-degree beacons.
An optical warning device that projects light in a defined horizontal arc of more than 40 degrees, but less than 360 degrees,and vertically from 5 degrees up to 5 degrees down. It will project flashes of light to an observer positioned at a fixed location within the arc of coverage. This would include all directional warning devices and omnidirectional devices within a lightbar that have a portion of their light beam blocked by internal components.
Any single, independently mounted, light-emitting component in the lighting system. An Emergency Warning Device (EWD) lamp assembly may consist of a single optical element or a fixed array of any number of optical elements whose geometric positioning relative to each other is fixed by the manufacturer of the device and not intended to be modified. To be considered a single source, the optical elements must be adjacent and operate simultaneously in all modes if the mode of the device is vehicle operator adjustable.
A device utilized on authorized vehicles to capture the attention of motorists and pedestrians and warn of a potentially hazardous activity or emergency situation. It provides 360 degrees of visual warning coverage. The device can also consist of an array of individual selective coverage EWD lamp assemblies within a common housing whose coverage angles overlap or adjoin such that 360 degrees of warning coverage results.
A device utilized on authorized vehicles to capture the attention of motorists and pedestrians and warn of traffic hazards such as a lane blockage or a slow moving vehicle. It provides 360 degrees of visual warning coverage. The device can also consist of an array of individual selective coverage EWD lamp assemblies within a common housing whose coverage angles overlap or adjoin such that 360 degrees of warning coverage results.SAE J845 pdf free download.