Get hold of Lee Preece. lee.preece@avfc.co.uk and his direct line is 0121 326 1502. It's the sort of thing that they won't know about if nobody tells them. Also PM amfy to get the Trust involved.
He is Supporter Liaison Officer - so he could take this up on fans behalf maybe? It's possible that it could carry a bit more weight from him, or that he could assess the level of inconvenience being caused by collating fan complaints. This might have more effect than a few individual fans contacting the highways agency.You can contact him direct, & I'll float it with him too.
I had similar massive delays getting to the game from the south east via the M6. There was a five mile tail back about a mile south of the Coventry exit caused by a lane being coned off for the common invisible reason. Add to that the massive congestion of the roadworks at the M1/M6 junction and the same at Kettering on the A14 and my 100 mile journey took over four hours, all on dual carriageway roads except a mile or two from my village to the A14.It was particularly infuriating because Bad English was in town and I missed him. All the time which should have been spent plying him with drink was spent raging at the Highways Agency.