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COLUMBIA, S.C. (AP) -- The state Department of Transportation estimates needing an additional $1.5 billion yearly over 20 years to bring roads to good condition. It's responsible for maintaining:

-- 41,444 highway miles: 851 interstate miles, 9,475 miles of federal and state highways, and 31,118 miles of secondary roads. Nearly 70 percent of secondary roads aren't eligible for any federal funding.

-- 8,383 bridges

-- 9 welcome centers

-- 19 rest areas

-- mowing of 128,000 roadside acres

-- 20 million feet of sidewalk

-- 1,700 miles of guardrail

-- 5,600 traffic signals and flashers

-- 643,000 traffic signs

-- 23 million feet of curbs and gutters

Of those nearly 8,400 bridges:

-- 7 are closed

-- 420 have weight restrictions for crossing

-- 886 are rated in poor condition

-- 777 are considered functionally obsolete, due to outdated designs

Of those nearly 41,500 highway miles:

-- 53 percent of secondary roads rate in poor condition; 36 percent are fair, and 11 percent are good

-- 47 percent of federal and state highways rate poor; 40 percent fair, and 13 percent good

-- 8 percent of interstate miles are poor, 23 percent fair, and 69 percent good

Source: SC Department of Transportation

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