Metropolitan Turnpike Trust

The Metropolitan Turnpike Trust (officially the Commissioners of the Turnpike Roads in the Neighbourhood of the Metropolis North of the River Thames) was the body responsible for maintaining the main roads in the north of the conurbation of London from 1827 to 1872. The commissioners took over from fourteen existing turnpike trusts, and were empowered to levy tolls to meet the costs of road maintenance.

More information on the Wikipedia page

Some details can be found in Post Office directories of the time.