I managed to acquire a number of early maps in a recent auction of some material from the Bath Postal Museum (sadly closed). The earliest maps I acquired are strip maps drawn by John Ogilby published in 1675 & 1698, this first being of a portion of the London to Bristol road, going from London to Marlborough.
I also acquired a hand-colourised Ogilby strip map of the road from Chippenham to Wells and Marlborough to Wells.
... and a plate from the 1939 reprint of the Ogilby maps showing London to Banbury.
In 1720 a half-scale version of John Ogilby's maps were published by Emanuel Bowen and John Owen - here is a strip map of the Chippenham to Wells road.
In 1785 Paterson's Itinerary was published as a book of strip maps, showing the houses of the gentry along the route. The first one below shows Bath to Bristol ...
... while the second is Devizes through Philip's Norton.