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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 .
The messages were referred to as "Sigmon traffic alerts," a phrase quickly shortened to "Sig Alert." The system, now employed throughout California , has been copied in numerous other areas. For this, Bill Keene called him the "father of L.A. traffic reporting".
57: 1984 Carolinas tornado outbreak – Twenty-four tornadoes were confirmed; seven were rated F4. In addition to the 57 tornadic deaths, 1,249 people were injured. This was and remained the deadliest official High Risk day (since SELS/SPC High Risk outlooks began) for over 27 years, surpassed by the Super Outbreak of April 27, 2011.
The High Five Interchange, north of downtown in Dallas, Texas, is a massive five-level freeway interchange.It is the junction of two major highways carrying heavy rush-hour traffic, the Lyndon B. Johnson Freeway and the Central Expressway (), and is the first five-level stack interchange to be built in the city.
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The airport opened for commercial service as Dallas/Fort Worth Regional Airport on January 13, 1974, at a cost of $875 million (equivalent to $5.5 billion in 2024), which included $65 million for the land and $810 million in total construction costs.
The Dallas–Fort Worth metroplex, officially designated Dallas–Fort Worth–Arlington by the U.S. Office of Management and Budget, [a] is the most populous metropolitan statistical area in the U.S. state of Texas and the Southern United States, encompassing 11 counties. Its historically dominant core cities are Dallas and Fort Worth. [5]
International Parkway is a major north–south freeway in the Dallas–Fort Worth metroplex.Its main purpose is to provide access to DFW Airport from the metropolitan area. . Part of the Parkway from its southern end at SH 183, (Airport Freeway) and SH 360 to the South Toll Plaza for DFW Airport is designated as State Highway Spur