For thinking read traffic patterns. Certain roads carry massively increased traffic all over holiday weekends, while most rail routes carry much less.The irony is that roadworks are often suspended over bank holiday weekends in complete contrast to railway thinking.
I have just driven from Shipley to near Blackburn via Skipton and taken 90 minutes instead of the normal 55 or peak hour 70 - simply because half Yorkshire seems to have headed for the Dales. That'll learn me!
No excuse for blocking all routes to the Sussex Coast or not having enough RRBs but that's a slightly different issue.