A blue sign with a diagram showing a branch off the road ahead and the following text.
Forward destinations: London; Hatfield.
Exit destinations: Welwyn Gdn City; Welwyn; A1000.
Junction number: 6.
There's a very congested downhill run after Stevenage before the road suddenly widens out to three lanes as we approach Welwyn.
With all these New Towns and Garden Cities around, this patch of Hertfordshire must have been very empty before the twentieth century's visionary urban planners came along.