If a handicapped employee, because of his handicap, is unable to use the most economical mode of travel he may avail himself of the most economical mode compatible with his handicap. In determining the next most economical mode of travel, the following must be considered:
The agency director of the employee's agency must certify as to the employee's handicap and as to his inability to use the most economical mode of travel.
No expenses will be authorized for attendants traveling with State employees.
S.C. Code Regs. § 19-101.18