just had a quick read & saw this.
''There have been instances of grid-lock in the Newingreen area, stretching as far as junction 11 of the M20, caused by the difficulties of customers accessing the Racecourse due to the cumulative short-comings set out above. The level of traffic that needs to use Stone Street occasionally inconveniences the residents, for example on busy days such as the East Kent Show in 2009.''