12.—(1) Any vehicle which has a speed limit of 60 kmph and below shall be driven along the left hand lane of the expressway specified in Part II of the Second Schedule except when overtaking another vehicle or passing an obstruction or in compliance with any traffic or directional sign.
(2) Paragraph (1) shall not apply to any vehicle which is using the expressway on the occasions and to the extent specified in rule 11(2)(a) and (b).