TRIP, a national transportation research group, found poor road conditions across the U.S. cost the average driver $515 per year. The study found 28 percent of the nation's major roads are in "poor condition" and need to be completely rebuilt. The $515 can be attributed to additional wear and tear on cars, worn tires, and decreased gas mileage. Based on the study, 35 percent of major urban roads in Colorado are in poor condition, which puts the state among New York, Michigan, and California. States with the lowest percentage of poor roads include Florida, Nevada and Minnesota.