If a weighbridge is portable –

(a) there must be a clearance of at least 150mm under the lowest live part of the platforms; and

(b) it must have a base that is stable when the weighbridge is in use; and

(c) the headwork and exposed levers must have adequate protection; and

(d) the ground under the platform must be treated to prevent the growth of foliage and must be kept free from any accumulation of water, mud and debris.