In message , at 21:59:12 on Wed, 19 Jun
2019, Clive D.W. Feather remarked:
In article , Roland Perry
writes
I have never in my life seen construction companies do this
even when the new road is well away from the old route
It costs millions extra to do it that way

Come and look at the A14 rebuild between Girton and Swavesey. It's being
done in a similar way.

And there's only disruption to the through traffic for two isolated
overnight periods (while they switch some virtual points)?

You have got-to-be-joking.

Let's see when it happens.

At the moment, the next disruption is a closure this weekend to demolish
what's left of the old Bar Hill flyover. Closures for this sort of
thing, or installing gantries, seem to be more disruptive than switching
the alignment.

Today I had the [dis]pleasure of driving the Girton to Milton section
again, and it's not noticeably further on than six months ago. Lots of
weaving contra-flow lanes, single in places, through traffic down to
30mph, and masses of work to do to even restore the original alignment -
let alone switch people from one free-flowing dual carriageway to
another with a set of overnight 'points'.
--
Roland Perry