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"Thankfully this was on the central reservation. If a hole of this nature had opened up on a carriageway it could well have led to tragedy. I don't think this is anything to do with potholes or general maintenance. There seems to have been some structural anomaly - perhaps some sort of geological fault or an old mineshaft.
Clearly, it's a concern that this has happened on a busy motorway that leads to and from the coast. Engineers will want to deal with this as soon as possible. If the stretch of motorway stays shut it will cause traffic problems, but safety must come first."
Comment: Sinkhole opens up in Barnehurst back garden, UK
M2 motorway closed in Kent, England after monster 15ft-deep sinkhole suddenly opens up in central reservation
30 foot-deep sinkhole swallows car overnight in High Wycombe, England