Idle Reduction Weight Exemption

https://afdc.energy.gov/laws/6414#:~:text=Idle%20Reduction%20Weight%20Exemption.%20A%20motor%20vehicle%20equipped,the%20added%20weight%20of%20the%20idle%20reduction%20technology.

A motor vehicle equipped with a fully functional idle reduction system designed to reduce fuel use and emissions from engine idling may exceed the state maximum weight limitations by up to 550 pounds to compensate for the added weight of the idle reduction technology. The vehicle operator must provide written certification of the weight of the technology and demonstrate the technology is fully functional.

(Reference [Washington Administrative Code](http://apps.leg.wa.gov/wac/) 468-38-073)