Remarks on the Present System of Road Making: With Observations, Deduced from Practice and Experience, With a View to a Revision of the Existing Laws, and the Introduction of Improvement in the Method of Making, Repairing, and Preserving Roads, and Defending the Road Funds from Misapplication. Seventh Edition, Carefully Revised, With an Appendix, and Report from the Select Committee of the House of Commons, June 1823, with Extracts from the EvidenceMcAdam, John Loudon
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Remarks on the Present System of Road Making: With Observations, Deduced from Practice and Experience, With a View to a Revision of the Existing Laws, and the Introduction of Improvement in the Method of Making, Repairing, and Preserving Roads, and Defending the Road Funds from Misapplication. Seventh Edition, Carefully Revised, With an Appendix, and Report from the Select Committee of the House of Commons, June 1823, with Extracts from the Evidence
McAdam, John Loudon
Macadam roads; Roads -- Great Britain
In the formation of roads under your management, to what shape do you
give the preference; I allude to the convex shape or the flat?—I
consider a road should be as flat as possible with regard to allowing
the water to run off at all, because a carriage ought to stand upright
in travelling as much as possible. I have generally made roads three
inches higher in the centre than I have at the sides, when they are 18
feet wide; if the road be smooth and well made, the water will run off
very easily in such a slope.
Do you consider a road so made will not be likely to wear hollow in the
middle, so as to allow the water to stand, after it has been used for
some time?—No; when a road is made flat, people will not follow the
middle of it as they do when it is made extremely convex. Gentlemen will
have observed that in roads very convex, travellers generally follow the
track in the middle, which is the only place where a carriage can run
upright, by which means three furrows are made by the horses and the
wheels, and the water continually stands there: and I think that more
water actually stands upon a very convex road than on one which is
reasonably flat.
What width would you in general recommend for laying materials on a
turnpike road?—That must depend upon the situation. Near great towns
roads of course ought to be wider than farther in the country. Roads
near great towns ought not to be less than thirty or forty feet wide,
but at a distance from great towns it would be a waste of land to make
them so wide.
You mean a breadth of thirty feet actual road?—Yes. The access to
Bristol for a distance of about three miles, if we had room between the
hedges, I would make about thirty feet wide. Between Bath and Bristol I
should wish to see the road wide all the way, because it is only the
distance of twelve miles between two large cities.
In what way do you make the watercourses at the sides of the road; I ask
that question, having observed the farmers, in exercising their power of
cleaning out their ditches, dig them to such a depth as to render them
dangerous to be passed at night?—I always wished the ditch to be so dug
as that the materials of the road should be three or four inches above
the level of the water in the ditch, and to that point we endeavour to
bring the farmers, but they are very unwilling to clean the ditches at
any time when called upon, and when they do it, if they find vegetable
mould in any quantity at the bottom of the ditch, they will prosecute
their inquiry much deeper than is useful, or proper for safety.
Do you consider you have power by law, at present, for preventing
that?—Yes; because the law says, they are to clean them out according to
the directions of the surveyors.
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