Minimum following distance.1.9 (1) A person driving an oversize vehicle or combination must maintain a distance of at least 200m from an oversize vehicle or combination travelling in front of it, unless: (a) it is overtaking the front one, or the front one is stopping; or (b) there is a separate lane available for the use of overtaking traffic; or (c) it is in an urban area and it is not reasonably practicable to maintain a distance of 200m.