Twenty-two percent of major roads and highways on the Missouri side of the St. Louis metro area are in poor condition, a national construction industry group says.

The report, released Wednesday by the Road Information Program (TRIP) to bolster the ongoing campaign to pass a state gas tax increase at the Nov. 6 election, said 29 percent of roads here are in mediocre shape.

The figures are similar to the ratings for major roads statewide in the study. Twenty-four percent are considered poor and 28 percent mediocre.

Meanwhile, the report said 7 percent of 1,903 St. Louis area bridges are structurally deficient. The percentage of bridges statewide in that category was much higher, 13 percent.

The report estimated that driving in the St. Louis area costs the average motorist $2,031 a year in extra vehicle operating costs due to roads needing repairs, lost time and fuel due to congestion-spurred delays and traffic crashes related to road features.

"TRIP's study shows bad roads cost Missourians money and time in big and small ways that add up to considerable expense, stress and frustration," said Scott Charton, a spokesman for SaferMo.com, the campaign committee for the gas tax hike.