In a recent Transport Focus survey, the motorway received a satisfaction rating of 76%, making it the nation's seventh highest-rated A road or motorway. Is the M4 really one of the UK's best motorways? The M4 stretches for 189 miles, connecting West London to Southwest Wales and passing through Reading, Swindon, Bristol, Newport, Cardiff and Swansea. These criticisms echo findings from an AA study earlier this year, which found the M4 to be among the UK’s worst motorways. Do you think the M4 is one of the best or worst motorways in the UK?