Motorway gantry sign
A gantry spanning the motorway with blue overhead signs showing the following text.
Forward destinations: The LAKES, Lancaster; Blackpool (M55) M6 .
Exit destinations: A59 Preston (C), Blackburn (N); Clitheroe .
Junction number: 31.
Samlesbury Interchange is the original motorway junction on the original motorway - though, again, if you've just arrived from 1958 in a time machine you're going to have a very hard time recognising it.