(1) constructed on or after 1 April 1993 and used by motorized vehicles in an open-pit mine shall have a width at least equal to:(a) 1 1/2 times the width of the widest vehicles if they are single-track roads;
(b) 2 1/2 times the width of the vehicles if they are 2-way roads;
(2) constructed in an open-pit mine at which operations begins on or after 1 April 1993 and used by motorized vehicles shall have a width at least:(a) 2 times the width of the widest vehicles if they are single-track roads;
(b) 3 times the width of the vehicles if they are 2-way roads.