Motorway cantilever sign
A blue overhead sign suspended over the motorway from a post on the left, with a diagonal arrow pointing up and left, and the following text.
M45 Coventry (S).
Junction number: 17.
When the M1 first opened this was the way onward to Birmingham and the North West, but it's long since been replaced with the M6. Today not much traffic leaves here and it's one of the UK's quietest motorways. You can see it's not even signposted for all of Coventry - just the south!