NASHVILLE (AP) - State safety and transportation officials have unveiled new protocols aimed at getting major highways reopened more quickly after crashes.

Tennessee Transportation Commissioner John Schroer and Tennessee Safety Homeland Security Commissioner Bill Gibbons announced the new rules on Thursday in Nashville.

Among them: a goal of 90 minutes maximum to re-open highways at crash sites, a reassessment of a wreck situation every 30 minutes and new rules regarding towing companies.

The departments began working on new procedures in December after a truck carrying potatoes crashed in Wilson County, closing Interstate 40 for nearly 12 hours and stranding hundreds of motorists overnight.