Without adopting Mr Bourn's 16-inch cast-iron garden rollers, the carriers of the period did, apparently, adopt the 9-inch wheels favoured by Parliament; but as they found that, with 9-inch wheels, they could carry much heavier weights, there had to be a further resort to legislation directed to a limitation of loads. This was done by 5 Geo. III., c. 38,[7] {48}while under 6 Geo. III., c. 43, turnpike trustees were directed to issue orders to their collectors not to allow any waggon or other four-wheeled carriage having wheels of less than 9 inches in breadth to pass through a toll-gate when drawn by more than four horses without seizing one of the horses. By 13 Geo. III., c. 84, the reduced tolls already conceded to 9-inch wheels were extended to 6-inch wheels, and it was further provided that waggons with 16-inch wheels should pass toll free for a year, and then pay only one-half of the tolls to be paid by 6-inch wheeled waggons. In order to give still further encouragement to the use of 16-inch wheels, an Act passed in the following year provided that any waggon having wheels of those dimensions should pass toll-free for five years instead of one, and pay only half toll afterwards. Among the many other Acts that followed, mention may be made of 55 Geo. III., c. 119, which gives an especially good idea of the infinite pains taken by the Legislature to adapt the construction of vehicles to the apparently hopeless deficiencies of the roads. The Act authorised road trustees to exempt certain vehicles from tolls for overweight "provided such Waggon, Cart or other such Carriage shall have the Soles or Bottoms of the Fellies of all the Wheels thereof of the Breadth of Six inches, or of Nine Inches, or of Sixteen Inches or upwards, and be cylindrical, that is to say, of the same Diameter on the Inside next the Carriage as on the outside, so that when such Wheels shall be rolling on a flat or level Surface, the whole Breadth thereof shall bear equally on such flat or level Surface; and provided that the opposite Ends of the Axletrees of such Waggon, Cart or other Carriage, so far as the same shall be inserted in the respective Naves of the Wheels thereof, shall be horizontal and in the continuance of one straight Line, without forming any Angle with each other; and so that in each pair of Wheels belonging to such Carriage, the lower Parts, when resting on the Ground, shall be at the same distance from each other as the upper Parts of such Pair of Wheels: Provided always," etc.