20.—(1) Unless paragraph 21 applies, engineering plant must not travel on roads at speeds exceeding—
(a)30 miles per hour on a motorway; or
(b)12 miles per hour on any other road.
(2) Engineering plant falling within sub-paragraph (1) is referred to in this Schedule as slow plant.
21.—(1) This paragraph—
(a)applies to any engineering plant that satisfies the speed condition specified in sub-paragraph (2), and to any vehicle-combination that includes engineering plant and that satisfies that condition; but
(b)does not apply to engineering plant mentioned in paragraph 2(1)(a).
(2) The speed condition is that the plant or vehicle-combination would be able to comply with such requirements of Schedule 1 to this Order as are specified in sub-paragraph (3), if those requirements applied to it as they apply to an AILV (or AILV-combination) falling within Category 1, 2 or 3.
(3) The requirements of Schedule 1 referred to in sub-paragraph (2) are—
(a)the requirements as to brakes, plates and signs in paragraphs 7 to 15;
(b)the requirements as to weight in paragraphs 26 to 33; and
(c)such of the requirements of the Construction and Use Regulations, the Authorised Weight Regulations and the Lighting Regulations as are specified in paragraph 35 or 36.
(4) For the purposes of the remaining provisions of this Schedule, any engineering plant, or vehicle-combination that includes engineering plant, which complies with the requirements applicable to an AILV (or AILV-combination) falling within Category 1, 2, or 3 (as the case may be) is itself to be treated as falling within the Category in question.
22.—(1) Engineering plant, or a vehicle-combination that includes engineering plant, which falls within Category 1, 2 or 3 must not travel on a motorway, dual carriageway or other description of road at speeds exceeding the speed specified in Table 10 for that Category in respect of the description of road in question.
| Vehicle or vehicle-combination | Motorway | Dual carriageway | Other roads |
|---|---|---|---|
| Category 1 | 60 mph | 50 mph | 40 mph |
| Category 2 or 3 | 40 mph | 35 mph | 30 mph |
(2) But where the plant or vehicle-combination does not have suspension on all axles, the plant or vehicle-combination must not travel at speeds exceeding 20 miles per hour.
23. Nothing in this Schedule is to be taken to authorise travel at any speed in excess of any speed restriction imposed by or under any other enactment.