Alan,
In the late 1950s, it used to take me 45 minutes at morning peak times to get from Howard Road, Kings Heath, into the city centre - I timed that many times - on with the 50 or 48/49 routes. I wonder how that compares with today. We were told that the Ringway would solve all the city's traffic problems, but no one at that time seemed to have allowed for the vast increase in traffic over the next few years.
I know that when I moved to Bournemouth in 1961, roundabouts were almost, but not quite, unheard of. Their popularity with the Council planners seemed to grow rapidly from then on, but I couldn't help but remark on several occasions that Birmingham could build a roundabout almost overnight whereas Bournemouth seemed to take forever with masses of traffic diversions.
Different story again here when I moved to Crete. Roundabouts are again in short supply, but where they do exist, no one seems to know the rules of the road and give way to those already on the roundabout. A few do, but perhaps they have lived in other places in Europe - the locals just make up the rules to suit themselves!
Maurice