Department of Public Works
dpw.lacounty.gov
Sustainability
Vehicle Safety Warning Beacons (Facilities & Shared Services)
Summary
Light Emitting Diode (LED) technology was used to replace halogen lamps, often with electrically operated rotating mechanisms, in traffic advisory light bars/beacons on Public Works vehicles. Prior to implementation, vehicle operators would typically leave engines idling during stationary work in field locations to prevent depleting the vehicle battery while operating the halogen rotating safety warning beacons. LED beacons use a fraction of the energy, have a longer lifespan, and are much more visible. Vehicle motors can be turned off when parked, saving fuel and reducing emissions, while continuing to alert other motorists of the presence of work vehicles. 
Benefits to Environmental Resources
The environmental benefits in regard to the LED usage in vehicle safety warning beacons resulted from reduced fuel consumption, less wear on engine components, and the corresponding reduction of greenhouse gas emissions and pollution production. 
Contribution to wellbeing of DPW and the County
LED beacons are high-intensity and much more visible in alerting motorists and other road users of a work zone and the presence of our workers who need protection while performing road related works.  Thus, this fleet operation improvement not only benefits and wellbeing of DPW employees, it also decreases possible accidents and contributes to the wellbeing of other motorists.
Contribution to Economic Health
Since vehicle motors can be turned off when parked, this translates to a fuel savings alone of up to $250,000 annually from ending the engine idling during stationary work.  Also, LED beacons have a longer lifespan and thereby have less maintenance or repair needs. This is an added cost savings that would provide more funds for other public improvements.
Modified By
Schleikorn, Letty
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