A reminder that Newmarket Road will be closed between 8pm on Friday, March 26 and 6am on Friday, April 2.

Here is some more information about it:

Newmarket Road will be closed to all (motorists, cyclists, and pedestrians) between Abbey Stadium and Leper Chapel from 8pm this Friday (26th March) until 6am on Friday 2nd April for work on the Chisholm Trail underpass.
There will be signed diversions in place for alternative routes. Motor traffic is via Barnwell Road/Coldham’s Lane, and cycle/foot traffic via Coldham’s Common. Please note that the jetty path between Stourbridge Common and Ditton Meadows will NOT be open.
A free shuttle bus will be operating 24 hours a day for pedestrians unable to use the diversion.
See here for further information:
Greater Cambridge Chisholm Trail

Citi 3, 11 and 12 buses will still be running, but with alternative routes, and some stop closures.
See here for updated routes and times:
Stagecoach Information on diversion routes

Cambridge Cycling Campaign posted information on cycle routes to avoid the closure:
Information from Cambridge cycling Campaign