BOISE, Idaho (AP) — A bill that could raise speed limits on Idaho roads is headed to the Senate floor after gaining the approval of the Senate Transportation Committee. Sen. Bart Davis, the bill's main sponsor, said the plan would give the Idaho Transportation Department the choice to increase legal speeds from 75 to 80 miles per hour on the interstate and from 65 to 70 miles per hour on state highways. The department would first have to conduct a study to evaluate the risks of a higher speed limit. Michael Kane of AAA warned against moving too quickly, saying the state should examine factors like weather, night driving and wear and tear on roads. Utah raised speed limits on some roads to 80 mph last year.