The conservation body says vehicles have flattened the stone structure on the A625 Hathersage Road three times this year already.
Now, it rebuilds with demolition in mind - keeping it low and not using mortar - to keep drivers safe and speed up reinstatement, bosses say.
The road from Sheffield turns sharply right at the popular pub. A large chevron sign indicates the bend.
The National Trust’s Longshaw estate is hugely popular with visitors from Sheffield.
Mark Bull, National Trust manager, said the wall was demolished about seven times a year.
He added: “People always say, ‘I wasn’t driving very fast, it was the road’. But nine times out of ten it’s down to speed.
“Sometimes we arrive and there’s a gap but no car and we have no idea who did it. Then we repair it at our own cost using our volunteers.
“If we find the owner we go through their insurance. Then we pay a contractor to do it.
“These days we try to build it in such a way that if a car goes through it everyone is safe. So we don’t use mortar or cement the coping stones.”
The NT at Longshaw also has to rebuild walls damaged due to deer and old age, he added.
A six-strong team of wall builders volunteers does the work.

1. 'Most demolished' wall
National Trust volunteer Steve Boyack working on the 'most demolished' wall at Longshaw. Photo: dw

2. Longshaw
Wall building volunteers for the National Trust at Longshaw: Philip Benson, Brian Curtis and Roger Salt. Photo: dw

