Federal agencies must assign available parking spaces to their employees using the following order of priority:

(a) Severely disabled employees (see definition in §102-71.20 of this chapter).

(b) Executive personnel and persons who work unusual hours.

(c) Vanpool/carpool vehicles.

(d) Privately owned vehicles of occupant agency employees that are regularly used for Government business at least 12 days per month and that qualify for reimbursement of mileage and travel expenses under Government travel regulations.

(e) Other privately owned vehicles of employees, on a space-available basis. (In locations where parking allocations are made on a zonal basis, GSA and affected agencies may cooperate to issue additional rules, as appropriate.)