Governor Terry Branstad is suspending the specific hours that drivers can transport propane in Iowa.
Branstad announced the emergency declaration Thursday. It goes into effect Friday and ends November 7th.
The declaration says Iowa residents have extremely low supplies of propane because of a late harvest and high demand for petroleum products throughout the Midwest.
The declaration adds that adequate supplies of propane are necessary for normal agricultural harvesting and residential heating, particularly in rural areas.
The suspension does not mean that fatigued or ill drivers should transport propane. Drivers needing rest should be given certain hours before they return to service.