Parkway was originally an American term but in England its use was expanded by Professor Patrick Abercrombie in his Open Space and Park System in his 1943/44 County of London Plan. He defined it as follows:
All forms of open space need to be considered as a whole, and to be co-ordinated into a closely-linked park system, with parkways along existing and new roads forming the links between the larger parks. It becomes possible for the town dweller to get from doorstep to open country through an easy flow of open space from garden to park, from park to parkway, from parkway to green wedge and from green wedge to Green Belt. A great advantage of the linking parkway is that it extends the radius of influence of the larger open spaces and brings the latter into more intimate relationship with the surrounding areas. Abercrombie defined the connecting links in the system as parkways and placed them in seven categories: linear strips of open space; riverside walks; footpaths through farmland; bridle tracks and green lanes; bicycle tracks; motor parkways; express arterial roads. The last two categories date from the time when driving a horseless carriage through a park or along a tree-lined street was a recreational activity. The original, American, use of the term parkway was to describe routes of this type.