30.—(1) A toll order authorising the charging of tolls by a concessionaire shall specify the maximum tolls which may be charged if, and only if, the road to which the order relates consists of or includes a major crossing to which there is no reasonably convenient alternative.
(2) The Department may make provision by regulations as to what is to be treated as a major crossing for this purpose and as to the circumstances in which another route is to be taken to be, or not to be, a reasonably convenient alternative.
(3) Subject to any such regulations, a major crossing means a crossing of navigable waters more than 100 metres wide and a reasonably convenient alternative means another crossing (other than a road ferry) which is free of toll and is within five miles of the crossing in question.
For this purpose—
the width of tidal waters shall be ascertained by reference to the mean high-water mark and the width of other waters by reference to the ordinary limits of the waters; and
the distance getween two crossings shall be taken to be the shortest distance between the centre lines of the two crossings.
(4) The order shall specify the maximum tolls which may be charged for the use of the crossing or any length of the road including the crossing; and if the condition as to absence of a reasonably convenient alternative is satisfied in relation to certain types of traffic only, the order shall make provision only in relation to those types of traffic.
If that condition ceases to be satisfied, generally or in relation to certain types of traffic, the provisions of the order as to maximum tolls shall cease to apply, or cease to apply to that type of traffic, for so long as that remains the case.
(5) The order may specify different maxima for different descriptions of traffic (which need not correspond with the classes of traffic prescribed by the designation order) and may provide for the amounts to be varied in accordance with a formula specified in the order.
(6) Regulations under this Article shall not apply in relation to an order if notice of the draft order, and of the relevant draft designation order, have been published before the regulations come into operation.