The clue to this is in realities. 'Suits' will use train and tube in London along with the 'riff-raff' because there isn't really a better choice; even taxi can be slow. Clearly, there is no intention of the Welsh Government to make Cardiff so unpleasant to access by car that it conforms with the London situation. The same goes for Bristol. Neither city has any plans for congestion charging; they have both invested instead in park and ride (bus). The other measures needed are (a) no OOT office (white collar) development (b) restrict city centre car parking and make it very costly.