Teardrop Light 36
Teardrop Light 36 : Usage By Country: (9) United States: In the United States, colors are generally regulated at the state and local levels, but there are some commonalities. (a) Red almost always denotes an emergency vehicle if the lights are facing forward. In the state of Iowa, red lights can also be used on a funeral hearse, but only during funerals. In Washington State, red lights are also used on tow trucks, but only if the vehicle is not in motion. In Wisconsin, tow trucks are required to be equipped with red lights but such lights may be operated only when the tow truck is standing on or near the traveled portion of a highway preparatory to towing or servicing a disabled vehicle. A near universal exception to this rule is school buses which are allowed to use rear and forward facing, usually alternatively phased flashing red lights just before, during, and after passenger loading & unloading as a signal for all other traffic to stop. (b) Amber or Yellow lights are often used by utility vehicles such as construction vehicles, tow trucks, snow plows, funeral escorts and hearses, security patrol vehicles or other vehicles which may be stopped or moving slower than the flow of traffic. Amber is usually the most permissively regulated color. (c) White is often used as an optional color on lightbars, though it may be restricted to emergency vehicles in some states. It is rarely used as the only color on a lightbar, though some states require flashing white beacons on school buses. Certain railroad-related machines, like fueling tankers or switching engines, may also use a flashing white light. Certain government vehicles, such as rural mail delivery vehicles, use a flashing white beacon in some states. (d) Green emergency lighting since 9/11 is now used by Homeland Security Agencies and Government/private security agencies protecting high risk government and Critical Infrastructure
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