ChesterfieldMotorway 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.
(A619) [Hollow square diversion symbol] Chesterfield; A616 Newark.
Junction number: 30.
The A616 will get you to Newark eventually, but it's quicker from here to take the A619 to Worksop and then head for the A1. But that's very wordy and would have made the sign much too big.