(d)
Definitions.--As used in this section the following words and phrases shall have the meanings given to them in this subsection:
"Defendant or defendants." Includes impleaded defendants.
"Off-road vehicle." A motorized vehicle that is used off-road for sport or recreation. The term includes snowmobiles, all-terrain vehicles, motorcycles and four-wheel drive vehicles.
"Off-road vehicle riding area." Any area or facility providing recreational activities for off-road vehicles.
"Off-road vehicle riding area operator." A person or organization owning or having operational responsibility for any off-road vehicle riding area. The term includes:
(1) Agencies and political subdivisions of this Commonwealth.
(2) Authorities created by political subdivisions.
(3) Private companies.
"Plaintiff." Includes counter claimants and cross-claimants.