In order to promote engineering and design quality and to ensure maximum competition by professional companies of all sizes providing engineering and design services, the commissioner of highways may establish cost principles for determining the reasonableness and allowability of various costs. These cost principles will govern the overhead ceilings, salary limits, expense reimbursement and any other cost the commissioner may deem necessary to regulate. The commissioner of highways shall propose a legislative rule pursuant to article three, chapter twenty-nine-a of this code regarding standard cost principles for determining the reasonableness and allowability of various costs. The legislative rule may include provisions for deviations from the standard cost principles in special situations and circumstances.