Which of the following vehicles are not allowed on a public road

(i) Any vehicle that has an overall width of more than 2.5 metres,
(ii) A bus of which the distance between the centre-lines of the tyres of the two front wheels exceeds 1,9 metres, if the overall width of such bus exceeds 2,6 metres,
(iii) A goods vehicle that has a gross vehicle mass of more than 12 000 kg, if the overall width thereof exceeds 2.6 metres.