Carriers and drivers must adhere to these requirements even during relief from FMCSA regulations: Drivers responding to provide "direct assistance" to an "emergency" meeting the definitions in 49 CFR 390.5 and declared by FMCSA or a governor, are exempt from applicable regulations in all States on their route to the emergency , even though those States may not be involved in the emergency or stated in the declaration of emergency.
These exemptions, when in effect, only apply to 49 CFR Parts 390-399. They do NOT exempt drivers/carriers from the requirements relating to CDL, drug/alcohol, hazardous materials, size & weight, or State/Federal registration and tax requirements. (However, a Governor's Declaration may add some of those exemptions - read the declaration for details.)
Even if an Emergency Declaration is still in effect, the emergency must be on-going and you must be providing direct emergency assistance in order to be exempt from safety regulations. An FMCSA Regional Emergency Declaration continues to exist for Hurricane Harvey. The Agency has created a special webpage – https://www.fmcsa.dot.gov/harvey – containing resources, links and information for commercial motor vehicle carriers and drivers. Additional content will be regularly added.
A second webpage – https://www.fmcsa.dot.gov/irma – has also been created containing resources, links and information for commercial motor vehicle carriers and drivers. Additional content will be regularly added. For a current list of regional and state-by-state Emergency Declarations, Waivers, Exemptions and Permits, see: https://www.fmcsa.dot.gov/emergency.