Whenever the Commissioner of Transportation is engaged in the planning of any limited access highway, interchange or connector to be located within the limits of any town, city or borough or consolidated town and city or consolidated town and borough he shall consult, to the fullest extent possible, with the chief executive officer and the planning commission, if any, of such town, city or borough or consolidated town and city or consolidated town and borough so as to conserve, preserve and, if possible, enhance the environment by insuring through such consultations that the proposed works will have the least adverse impact on the environment.