OKLAHOMA CITY (AP) — A national transportation research group says deteriorated and congested roads and bridges in Oklahoma cost the state's motorists $5 billion a year in higher vehicle costs, crashes and congestion-related delays.

A report released Wednesday by the Washington, D.C.-based nonprofit group TRIP says almost three-fourths of major locally and state-maintained urban roads are in poor or mediocre condition and that 15 percent of Oklahoma's bridges are structurally deficient — eighth highest in the nation.

The report says Oklahoma's major urban roads are becoming increasingly conges...