Motorway gantry sign
A gantry spanning the motorway with blue overhead signs showing the following text.
Forward destinations: Preston, Warrington; L'pool, Leeds, M'cr (N) M6 .
Exit destinations: M56 N. WALES, Chester, Runcorn; A50 Warrington (South), Lymm.
Junction number: 20.
A tangle of tarmac will allow you to reach the M56 westbound, or the A50 to Warrington and Lymm, but not the M56 eastbound - not without a lot of effort, anyway.