The various provisions in respect to number of horses or oxen per cart or waggon failed to keep down the loads to a weight suited to the deficiencies of the roads—which deficiencies had continued, notwithstanding the turnpikes—and a further step was taken under 14 Geo. II., c. 42, which authorised turnpike trustees not only to erect weighing machines but to impose an additional toll of twenty shillings per cwt. on any waggon which, together with its contents, had a total weight exceeding 60 cwt. By Geo. II., c. 43, the trustees were authorised to levy the same additional toll on any vehicle drawn by six horses.

In addition to adopting these various restrictions on the weights carried, Parliament had devoted much attention to the construction of the vehicles employed. One of the provisions of an Act passed in 1719 was a regulation in respect to the breadth of the wheel-rims, or "fellies," and the use thereon of rose-headed nails, these being regarded as injurious to the roads; though in the following year came another Act which recited that as the extending of these regulations to waggons that did not travel for hire had been found detrimental to farmers and others, and, also, to the markets of the Kingdom, they were repealed—only, however, to be revived, by 18 Geo. II., c. 33, in 1745.

Parliament was now to devote much more attention to the subject of broad wheels; and how this came about is explained by Daniel Bourn in a pamphlet entitled, "A Treatise upon Wheel Carriages" (1763), the main purpose of which was to expound to the world the excellences of what the writer described as "that noble and valuable machine, the broad-wheeled waggon." He gives the following account of the origin of the said machine:—

"The first set of broad wheels made use of on roads in this Kingdom were erected by Mr James Morris, of Brock-Forge, near Wiggan in Lancashire; who having a deep bad road to pass with his team advised with me upon the subject; I mentioned the making of the fellies of his wheels of an uncommon width: He accordingly made his first set thirteen inches, and the next year another of nine inches in the sole; and his travelling with these to Liverpool, Warrington and other places, was took notice of by some persons of distinction, particularly Lord Strange, and Mr Hardman, Member for Liverpool, &c., who after making strict enquiries of Mr Morris, concerning their nature and properties, reported their utilities to the House, which occasioned an Act of Parliament being made in their favour....

"Therefore let us congratulate ourselves on making thus far so happy a progress; and as the publick roads continue to mend and improve, as they polish and smooth, and arrive nearer perfection, so let us try if the carriage that travels this road may not continue to improve too, and receive a similar degree of perfection."

The Act of Parliament referred to by Bourn was, presumably, that of 26 Geo. II., c. 30, which laid down that—with certain exceptions—no cart or waggon should be allowed on any turnpike road at all unless the "fellies" of each and every wheel had a breadth of at least nine inches, the penalty for a breach of this enactment being a fine of £5, with one month's imprisonment in default of payment, and forfeiture of one of the horses, together with its harness, to the sole use and benefit of the person making the seizure. As a further encouragement of such wheels, the trustees of turnpike roads were required to accept reduced tolls for all vehicles having wheels of a breadth of nine inches. Two years later a further Act (28 Geo. II., c. 17), set forth that, the former statutes relating to cart-wheels not having answered the good purposes intended, it was now provided that for a period of three years from June 24, 1753, waggons having 9-inch wheels were to be allowed to pass free through every turnpike in the Kingdom, the trustees being authorised to protect themselves against loss from such free passage by imposing higher tolls on all carts and waggons the wheels of which were not nine inches in width.

The idea in having these broad wheels was that they would not only be less injurious to the roads than the narrow wheels, but would even tend to keep the roads in good order by helping to smooth and consolidate them in the same way as would be done by garden rollers. Mr Bourn, who was an enthusiast on the subject, even proposed to have cart and waggon wheels made of cast iron with a breadth of sixteen inches! He says in his pamphlet:—

"I would recommend having the wheels made in the following manner:—

"Let there be run out of cast iron at the founders hollow rims or cylinders, about two feet high, sixteen inches broad or wide, and from one to near two inches in thickness, according to the design or necessity of the proprietor, and the burden he intends them to bear. Let the space, or cavity between these cylinders be filled up solid with a block of wood, through the center of which insert your arbor or gudgeon, and leave it two inches and six eighths at each end longer than the cylinder; which parts must be round, and about two inches thick, being the pivots, and when the whole is well wedged the wheel is compleat.

"Here then is a solid wheel, which answers all the intentions of the garden roller; now can anything be conceived that would have so happy a tendency upon the roads? to render them smooth and even to harden and encrust the surface, and make it resemble a terrass walk? I say, can anything be equal to these kind of cast iron rollers to produce the foregoing effects?"