PHOENIX — Arizona motorists should pay an extra $14 or $15 a year in registration fees to keep the state parks system operating, a special task force is recommending.

In a report to Gov. Jan Brewer, the panel concluded the parks system “is threatened with extinction and cannot survive under a roller coaster system of financial support.” Committee members said even if half of motorists opted out — something they could legally do — the program could raise $40 million a year.