"Authorized emergency vehicle" means an on-duty vehicle of any fire department, police department, sheriff's office, Washington state patrol, ambulance service, public or private and which is equipped with emergency lights and siren and used to respond to emergency calls.

"Cash customer" means a toll customer who pays the toll on the Tacoma Narrows Bridge at a to1l booth.

"Citizens advisory committee" means the citizens committee established by RCW 47.46.090 that advises the transportation commission on Tacoma Narrows Bridge toll rates.

"Department" means the Washington state department of transportation (WSDOT).

"Express toll lanes" means one or more highway lanes that can be used by authorized high-occupancy vehicles, and by toll-paying vehicles, where toll rates are set to maintain travel speed and reliability.

"Good To Go!™" is the name of the department's toll collection system.

"Good To Go!™ Pass" means the transponder device used to pay a toll by a customer who has a toll account.

"High-occupancy toll (HOT) lanes" means one or more lanes of a highway that charges tolls as a means of regulating access to or the use of the lanes in order to maintain travel speed and reliability. HOT lane supporting facilities include, but are not limited to, approaches, enforcement areas, improvements, buildings, and equipment.

"Highway or transit operating and maintenance vehicle" means a vehicle assigned to operate or maintain the toll facility, including incident response vehicles, transit service supervisor or maintenance vehicles, and agency tow trucks.

"On-duty" means the vehicle is operating in an official capacity.

"Pass" see Good To Go!™ Pass.

"Pay By Mail" means the method used to pay a photo toll when a toll bill is mailed to the vehicle's registered owner.

"Pay By Plate" means the method used to pay a photo toll by a customer who has a toll account.

"Photo toll" means a charge associated with a particular vehicle that is identified by its license plate.

"Privately owned and operated passenger bus" means: (a) A vehicle with a carrying capacity of sixteen or more persons, including the operator, which must be clearly marked or identified to display the business name and/or logo on the driver and passenger sides of the vehicle; operate on a fixed schedule and fixed route, serve the public and/or employees, and meet the annual certification requirements of the department; and (b) privately owned and operated passenger buses designed for carrying ten or more persons, including the operator, with an elevated passenger deck located over a baggage compartment, including charter buses, which serve the public on a regular schedule and on a continuing basis.

"School bus" means a vehicle with a seating capacity of more than sixteen persons, including the driver, regularly used to transport students to and from school or in connection with school activities.

"Toll account" means a Good To Go!™ account that is linked to a Pass (transponder) or license plates in order to pay a toll by automatic debit.

"Transponder (Pass)" means a device attached to a toll customer's vehicle that automatically identifies the toll customer's vehicle as it passes through the toll facility.

"Transportation commission (commission)" means the Washington state transportation commission whose duties and composition are set out in chapter 47.01 RCW.