I know exactly what you mean when you mention the traffic and roads in East Sussex, I hate driving now, but have to because of my job.
That part of Yorkshire sounds like a nice place to live.
I have lived in Sussex all my life.
Born and bred in Brighton and lived there for 32 years. Also lived in Sompting for a very short time and Seaford for nearly 3 years.
Live in Newhaven now obviously.