Flying at the Upper Vertical Limit of Restricted Airspace

[jetstar1]

I can't remember where the reference is

AIP ENR 1.4 - 1.1.7

When ATS airspaces adjoin vertically (one above the other), flights at the common level must comply with the requirements of, and will be given services applicable to, the less restrictive class of airspace. In applying these criteria, Class C airspace is considered less restrictive than Class A airspace; Class D airspace is considered less restrictive than Class C airspace, etc.

Would this be the same for a restricted area?

Yes - the Class G airspace is less restrictive than the PRD airspace.

j1