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Sig alert, Sig-alert or Sigalert in California, as well as other parts of the United States, means an incident that significantly disrupts road traffic.The term was originally the name of a pioneering system of automated radio broadcasts regarding traffic conditions, introduced in the 1950s and named after its inventor, Loyd Sigmon.
SigAlert shows traffic backed up west toward Interstate 5. Drivers are being told to expect delays of up to 20 minutes. Multiple road closures have been reported as authorities respond to the crash.
Traffic congestion was of such great concern by the late 1930s in the Los Angeles metropolitan area that the influential Automobile Club of Southern California engineered an elaborate plan to create an elevated freeway-type "Motorway System," a key aspect of which was the dismantling of the streetcar lines, to be replaced with buses that could ...
Together with its sister companies Metro Networks, Metro Source, Total Traffic Network, SigAlert and Traffax, the company operated a number of local and regional news and traffic operations that provided regular reports to affiliates. The company was founded in 1975 by Michael Lenet in Philadelphia, Pennsylvania. [1]
The crash was reported shortly after 3 a.m. Thursday on the southbound side of Interstate 5 near Las Pulgas Road. Traffic remained at a standstill for hours.
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Traffic Message Channel (TMC) is a technology for delivering traffic and travel information to motor vehicle drivers. It is digitally coded using the ALERT C or TPEG protocol into Radio Data System (RDS) [ 1 ] carried via conventional FM radio broadcasts .
In 1955, Sigmon invented a specialized radio and tape recorder that the Los Angeles Police Department used to alert radio stations throughout the city to traffic conditions and emergencies. The messages were referred to as "Sigmon traffic alerts," a phrase quickly shortened to " Sig Alert ."