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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.
Foothill Freeway I-10, 215 Interchange traffic towards downtown San Bernardino.. The Inland Empire is crossed by two interstates and several major state highways. Although major freeway construction was finished years ago (except for the recent completion of SR 210 from Fontana to San Bernardino), growth in the region has strained the freeway system.
San Diego ranked 17th in the same study, with 0.659 lane-miles per thousand, and the Inland Empire ranked 21st, with 0.626. ... Sigalert Los Angeles Traffic Report;
The Inland Empire (commonly abbreviated as the IE) is a metropolitan area and region inland of and adjacent to coastal Southern California, centering around the cities of San Bernardino and Riverside, and bordering Los Angeles County and Orange County to the west and San Diego County to the south.
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The main north–south arteries are U.S. Route 101 (US 101), which travels close to the coast from Downtown Los Angeles, across the Golden Gate Bridge, and to the Oregon state line, and Interstate 5 (I-5), which travels inland from the Mexico–United States border to the Oregon state line, effectively bisecting the entire state.
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 ."
It is a major thoroughfare for traffic between San Diego and the Inland Empire, as well as between Southern California, Las Vegas, Nevada, and the Intermountain West. South of its junction at I-8 in San Diego, the highway becomes SR 15, extending 6.13 miles (9.87 km) [1] to I-5, about 12 miles (19 km) from the Mexico–United States border.