[§271-26.5]  Change of address;responsibility; service of orders.  A motor carrier shall have, maintainand operate from a definite place of business in the State and shall displaytherein the certificate or permit issued by the public utilities commission. The certificate or permit holder shall report any change of address ortelephone number to the commission within five business days from such change. Communications, correspondence and service of orders and other officialdocuments shall be made upon the certificate or permit holder at the lastrecorded address on file with the commission.  Proof of service by certified orregistered mail to the last known address shall constitute a valid service ofany commission's order. [L 1978, c 66, §5]