Up until recently, there was also a sign showing the A2 as a primary route on Strood High Street but it was removed by Medway Council during improvement works.
It is still shown on Google Maps:
https://goo.gl/maps/qToFngX8ee4XYhhJ7
Oddly, it was a white sign with the green box with ‘A2’ written in it and nothing else.
this is quite strange as the A2 through Medway has not been a primary route since the M2 was opened in 1963 and this sign is clearly too new to be installed then.
I’m not sure whether it qualifies for this forum as it may have been put in for another purpose?
EDIT: Previous road improvements in the area in the 1980s may have seen this sign installed to replace a previous sign there with the green signs being introduced in the 1960s.