The voids, which were up to three metres deep in places, were unexpectedly found in September.
Working on behalf of Highways England, both Interserve and WSP had to dig out the voids to fully realise the extent of them, before being able to repair and resurface them.
Drainage repairs, sheet piling installation and environmental works were also carried out to ensure there would be no recurrence of these voids. Overall, 1,200 tonne of filling material was used.
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Further work will continue on the embankment, including replacing rabbit netting and top soiling, but this will be completed off the road itself, with a hard shoulder closure and temporary 40mph speed limit the only remaining restrictions.
Highways England project manager Karl Brooks said: "Safety is at the heart of everything we do at Highways England, and once we realised the extent of these voids underneath the M11 we moved quickly to get it repaired.
"While we want to limit the impact that our work has on people's journeys, these voids did need to be repaired with haste and we needed to ensure that there would be no more surprises. We have worked with our partners to minimise the impact this work has had, and are pleased that we are now able to fully re-open the M11 to traffic at Girton."
(LM/MH)
