COLUMBIA (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• 777 are considered functionally obsolete, due to outdated designs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