Highways Agency saying, according to Cam Eve News, that the closure could last to Wednesday 12th.
Could be due to the problems at Duxford, just saw this on the traffic news.
“Road closed and queueing traffic due to concerns over Duxford aircraft hanger roof in high winds on M11 both ways from J11 A10 Cambridge Road (Cambridge South / Harston) to J9 (Saffron Walden).”
Reopened in the last hour (1230)
Still closed, according to Traffic, News and Police 
EDIT: Yes, it is now open: google.co.uk/amp/s/www.camb … 722329.amp
Structural engineers have inspected the roof this morning.