It's only 12 km NE of Arras so even a taxi should be possible. I believe there are buses which would take you close enough to walk to the site, probably best checked locally.
I found it extremely interesting on a visit a few years back. There are areas of reconstruction of trenches and you can really get the feel of how it must have been. The distance between the two 'lines' is not very far, near enough to recognize faces!
I have visited Arras a couple of times and found it a very attractive town of the Flemish type, two huge central squares with beautiful buildings of that style. In fact I need to go again because I found out only last year that my Grandfather is commemorated on the big Arras war memorial. Good old internet.
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