S2.16 Livestock must be checked to ensure that they are evenly distributed and
remain fit to travel:
(b) within 30–60 minutes of commencement of the journey;
(c) at least every 2–3 hours as road conditions warrant;
VALE have tailed plenty of trucks (tedious, time consuming and expensive) and can vouch that this definitely does NOT happen routinely.....but again.....its only ASEL....not followed....not policed!