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United States. In the United States, response codes are used to describe a mode of response for an emergency unit responding to a call. They generally vary but often have three basic tiers: Code 3: Respond to the call using lights and sirens. Code 2: Respond to the call with no lights or sirens. The term "Code 4" is also occasionally considered ...
The 1911 New York Penn Station project was one example of this type of color light signal, with an outer colored 8 3/8" optical lens, some of which are still in service as of 2011. Development of the doublet lens by Churchill at Corning Glass Works allowed an electric light source to be more effective than with previous daytime colorlight ...
Red and blue emergency lights on a fire engine in Canberra, Australia. Emergency vehicle lighting, also known as simply emergency lighting or emergency lights, is a type of vehicle lighting used to visually announce a vehicle's presence to other road users. A sub-type of emergency vehicle equipment, emergency vehicle lighting is generally used ...
The use of 8-1-1 for "call before you dig" services was long established in California and Nevada, through an organization known as Underground Service Alert, before the FCC mandated its use for this purpose. While "call before you dig" and the 8-1-1 phone number is the primary awareness campaign in the United States, Canada has switched to ...
In the United States, a federally-mandated safety inspection performed on a locomotive every 92 operating days [201] Quiet zone (US) A designation by the Federal Railroad Administration that removes the requirement for train operators to sound their horn when approaching each public crossing in a certain area, often near residential ...
Significant weather advisory (SPS; alt.: significant weather alert) – A strong thunderstorm below severe criteria, containing small hail below 1 inch (2.5 cm) diameter, and/or strong winds of 39–57 miles per hour (63–92 km/h), is indicated by Doppler weather radar and may create some adverse impacts on travel.
ISO 22324. ISO 22324:2022, Security and resilience — Emergency management — Guidelines for colour-coded alerts, is an international standard developed by ISO/TC 292 Security and resilience. This document provide guidelines for color codes to indicate severity of hazards in public warnings. There are many different systems are already in use ...
D Line (Los Angeles Metro) 55 mph (89 km/h) (max.) The D Line (formerly the Red Line from 1993–2006 and the Purple Line from 2006–2020) is a fully underground 5.1-mile (8.2 km) [1] rapid transit line operating in Los Angeles, running between Koreatown and Downtown Los Angeles. It is one of six lines on the Metro Rail system, operated by the ...