backlane In this Act and in by-laws made thereunder the expression "backlane" includes every back-lane whether now or hereafter existing and any part thereof and any approach thereto and all land already or hereafter acquired or set apart for or laid out as a back-lane and all channels, drains and appurtenances of a back-lane. ACT 133 - STREET, DRAINAGE AND BUILDING ACT 1974 69. General provisions as to back-lanes.