Congressional research Service - Border Security: Barriers Along the U.S. International Border
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In FY2007, CBP constructed 110 miles of vehicle barriers. Through early April in 2008, CBP had constructed an additional 32 miles of vehicle barriers, bringing the total vehicle barrier mileage to 142.
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Despite these challenges, as of the end of 2008 CBP had constructed 296 miles of pedestrian fencing and 282 miles of vehicle barriers. As of February 13, 2009, CBP had constructed 306 miles of fencing and 301 miles of vehicle barriers
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In 1996, Congress passed the Illegal Immigration Reform and Immigrant Responsibility Act (IIRIRA), which, among other things, explicitly gave the Attorney General broad authority to construct barriers along the border and authorized the Immigration and Naturalization Service (INS) to construct a secondary layer of fencing to buttress the completed 14-mile primary fence. Construction of the secondary fence stalled after 9.5 miles had been completed due to environmental concerns raised by the California Coastal Commission (CCC)
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