The contractor, upon the request of the Department of Transportation, shall provide vehicles, manpower and equipment to perform emergency towing on or from a parkway, under the supervision of an authorized representative of the Department of Transportation. This service will be paid for on an hourly basis by the Department of Transportation, and no charge will be made to the parkway user. This rental system will be put into effect by the Department of Transportation at its discretion during emergency periods. The rental rate listed in Attachment 1, to be paid by the Department of Transportation, shall be considered as reimbursement for all costs during such emergency periods, including breakage, furnishing of equipment, furnishing of personnel, etc. The Department of Transportation specifically reserves the right to set the hours that such rental will be in effect, as well as the number of trucks and men to be utilized.