I live in Rackham and travel between here and Rustington on a regular basis so experiencing the awful congestion around Crossbush. I therefore fully support a bypass for Arundel.
A particular problem currently caused by the bottleneck at Arundel is that a large number of vehicles leave the A27 at Shoreham and travel via Steyning, Storrington and Amberley to Fontwell where they re-join the A27.
This causes serious traffic problems on the B2139, which goes through the heart of the South Downs National Park (indeed the additional traffic in Storrington makes it one of the most polluted small towns in the country).
Also the high volume of traffic on the B2139 makes it a very dangerous road.
Please can we have an Arundel bypass soon.