There should be a staged approach to the ending of the snarl-up usually found at Wincheap roundabout. This is mainly due to traffic trying to exit on to the A28 towards the Industrial Estate and Ashford. The right turn on the A28 which is just past the railway bridge and leads into the Estate is a major cause, especially when cars or lorries are parked opposite the turning. This problem is aided and abetted by the lights at the pedestrian crossing a short distance after. The first stage solution is to move the lights from the pedestrian crossing and place them at the right turn to the Industrial Estate.
Many pedestrians try to cross at that point anyway, adding to the slowdown.
As a bonus, borrow an idea from London and have 'no stop' red lines each side from the roundabout to the junction. The second stage should be to have lights at the Wincheap roundabout itself controlling the cars turning right from Rheims Way under the bridge, along with yellow boxes to stop vehicles blocking the road. London has used this idea with good effect at the Lambeth bridge south roundabout. After many years with one set of lights controlling the west entrance they have recently installed another set controlling the east side.