Iowa has joined several other Midwestern states in granting waivers to truckers who haul fuel.

Until Aug. 11, the affected drivers are excused from the normal hours-of-service rules.

Gov. Chet Culver said heavy demand for fuel and refinery outages – including one in Coffeyville, KS – made bending the rules necessary.

This week, North Dakota’s governor extended until July 28 a waiver that lets fuel tanker truck drivers ignore the hours-of-service rules.

According to The Associated Press, the original waiver was set to expire Wednesday night, but Gov. John Hoeven extended it.