for determining the highways or, in Scotland, roads in their area which may or may not be used by public service vehicles;

for fixing stands for public service vehicles on such highways or roads;

as to the places at which public service vehicles may stop for a longer time than is necessary for taking up and setting down passengers; and

as to the manner of using such stands and places.

so as to apply only to public service vehicles of a specified class, or

so as to have effect as respects a limited period only or as respects only limited periods in the year,