A green sign with a diagram showing an exit branching off the road ahead and the following text.
Forward destinations: The NORTH; (M62).
Exit destinations: Darrington; Womersley.
I did a lot of driving lessons in Darrington, with my driving instructor alternately telling me off if I crept above 30mph in a 30 limit and telling me off if I didn't accelerate fast enough when we passed the National Speed Limit sign.