This is a complex double junction. Clockwise leave at J30, anti-clockwise at 31 (watch for signage before entering Dartford Crossing to ensure that you are in the correct lane).
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Thurrock Services has all the usual facilities of a motorway service station including a hotel. Electric vehicle charging is available. Opposite the exit is the Lakeside shopping centre. Traffic for this can be heavy, before Bluewater was built queues at Christmas and for the January sales backed up onto the motorway.
Travelling clockwise this junction marks the end of the motorway. There is no path for pedestrians or cyclists over the QE2 bridge. Cyclists must use the dedicated cycle track to the Crossing Control point from where a patrol vehicle will ferry them across.
The toll plaza for the Dartford Crossing has been removed and the charge must now be paid
on-line
or through a Payzone outlet.
I have found that if travelling anti-clockwise at busy times leaving the services can be a pretty slow process as you need to cross the traffic stream leaving the motorway for London.