History
In Tucson, AZ all exits between Prince Road and 22nd Street are being reopened after an extensive, three-year improvement project. I-10 has been being widened from six to eight lanes, and seven bridges and underpasses have been built to deal with congestion. Plans are also under way to widen I-10 from Marana north to the I-8 interchange at Casa Grande from 4 lanes to 6 lanes starting in the later half of 2007 and continuing into 2008 and 2009.
Texas formerly shared the highest speed limit in the nation with Utah's test section of I-15. The speed limit along I-10 from Kerr County to El Paso County was raised by the Texas Legislature to 75 miles per hour (121 km/h) in 1999 and to 80 miles per hour (130 km/h) in 2006. However, the nighttime maximum speed limit remained 65 miles per hour (105 km/h) and the daytime truck speed limit was 70 miles per hour (110 km/h). With 70,000 miles (110,000 km) of highway in Texas the 432-mile (695 km) stretch of Interstate 10, and 89 miles (143 km) of Interstate 20, between Monahans and the I-10 interchange at the cusp of the Jeff Davis Mountains, only a small percentage of roads were affected.
On September 1, 2011, night-time speed limits were eliminated and the statutory maximum speed limit in Texas was increased from 80 to 85 mph, although no 85 mph speed zones have yet been established.
Read more about this topic: Interstate 10
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