In the second reading speech for the Ellenbrook National Park (Restriction of Entry) Bill, the relevant Commonwealth Minister says :

"We have been concerned for some time that the Ellenbrook National Park which is on Commonwealth land, enjoyed each year by thousands of bush walkers, cyclists and family picknickers is being ruined by heavy traffic.

This legislation will restrict vehicular access to the Park so that the present users of the Park will continue to enjoy it in the years to come"

The Bill passes. The new Act carries the short title : "An Act to restrict traffic into the Ellenbrook National Park".

Section 5 of the Act reads : "No vehicle shall be permitted entry to the Ellenbrook National Park".

Mary, who has been cycling through the Park every weekend for the past 20 years, is refused entry with her bicycle by a Park Ranger the weekend after the Act commences.

Discuss whether the Ranger is entitled to restrict Mary's entry to the Park.