The exemption under clause 14 of a person using, or causing or permitting the use of, a trailer is subject to the following conditions:(a) the rear overhang of the trailer must not exceed 5 metres;(b) if travelling in daylight, a red flag must be affixed to the rearmost point of the load;(c) if travelling at night, a red light must be affixed within 200 millimetres of the rearmost point of the load;(d) the trailer must not exceed 2.5 metres in width.