Heavy traffic is building up as weekend roadworks on a major motorway sliproad overrun. The M2 London-bound entry slip road is shut at Junction 5 for the A249 Stockbury roundabout in Sittingbourne due to works which were scheduled to finish yesterday. Vehicles are queuing back to junction 4 for Gillingham. There is currently no estimated time for reopening. This weekend saw a full closure of the Stockbury roundabout exit to the M2 junction 5 London-bound from 8pm on Friday, March 15. It was due to open again at 5am today. Currently, the A249 Maidstone-bound from the Stockbury roundabout to Chu…