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In March 2005, the United States Federal Communications Commission (FCC) made 8-1-1 the universal number for the 71 regional services that coordinate location services for underground public utilities in the U.S. [12] Before that time, each of these "call before you dig" services [13] had its own 800 number, and the FCC and others wanted to make it as easy as possible for everyone planning an ...
The Manual on Uniform Traffic Control Devices for Streets and Highways (usually referred to as the Manual on Uniform Traffic Control Devices, abbreviated MUTCD) is a document issued by the Federal Highway Administration (FHWA) of the United States Department of Transportation (USDOT) to specify the standards by which traffic signs, road surface markings, and signals are designed, installed ...
N11 code. This U.S. road sign alerts highway users to the availability of 9-1-1 service. An N11 code (pronounced Enn-one-one) is a three-digit dialing code used in abbreviated dialing in the North American Numbering Plan (NANP). The mnemonic N stands for the digits 2 through 9 and thus the syntax stands for the codes 211, 311, 411, 511, 611 ...
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 a response ...
Barricade tape is also known as construction tape or barrier tape, or in reference to the safety hazard involved as caution tape, warning tape, danger tape or hazard tape. When used by police, the tape is named police tape. The tape is often wrapped and affixed as a visual warning sign and demarcation, for instance against entering a dangerous ...
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 ...
Traffic lights normally consist of three signals, transmitting meaningful information to road users through colours and symbols, including arrows and bicycles. The regular traffic light colours are red, yellow (also known as amber), and green arranged vertically or horizontally in that order.
The U.S. Route shield is the highway marker used for United States Numbered Highways. Since the first U.S. Route signs were installed in 1926, the general idea has remained the same, but many changes have been made in the details. Originally, the shield included the name of the state in which the sign was erected and the letters "U S" on a ...