The Wealth of Nations by Part 5 Chapter 1 Page 100

The proprietors of the tolls upon a high road, therefore, might neglect altogether the repair of the road, and yet continue to levy very nearly the same tolls.

It is proper, therefore, that the tolls for the maintenance of such a work should be put under the management of commissioners or trustees.

In Great Britain, the abuses which the trustees have committed in the management of those tolls have in many cases been very justly complained of. At many turnpikes, it has been said, the money levied is more than double of what is necessary for executing, in the completest manner, the work which is often executed in very slovenly manner, and sometimes not executed at all. The system of repairing the high roads by tolls of this kind, it must be observed, is not of very long standing.