(a) The Secretary is authorized to perform by contract or otherwise, authorized engineering or other services in connection with the survey, construction, maintenance, or improvement of highways for other Government agencies, cooperating foreign countries, and State cooperating agencies, and reimbursement for such services, which may include depreciation on engineering and roadbuilding equipment used, shall be credited to the appropriation concerned.

(b) Appropriations for the work of the Federal Highway Administration shall be available for expenses of warehouse maintenance and the procurement, care, and handling of supplies, materials, and equipment for distribution to projects under the supervision of the Federal Highway Administration, or for sale or distribution to other Government agencies, cooperating foreign countries, and State cooperating agencies, and the cost of such supplies and materials or the value of such equipment, including the cost of transportation and handling, may be reimbursed to current applicable appropriations.