It's a toss-up as to whether the dimmest people in the UK either work at HM Treasury or in the roads department of local councils.
However, as I write this, the International Monetary Fund has not yet arrived in the UK to pull the plug on our overdraft. So, I'll go with local traffic planners.
Every day I travel out of London on the A3, which means passing through the Wandsworth one-way system, a notorious bottleneck that many drivers will have experienced.
Strictly speaking, it's a Gyratory. Wandsworth High Street copes with the eastbound traffic and a new road, running in parallel to the high street, handles eastbound traffic. At peak hours it is a nightmare.
Now the logistic geniuses at Transport for London have decided that the Gyratory, so beloved of 1970s traffic planners, will be steadily wiped off the Greater London map.
The first to go was Aldgate on the eastern edge of the City. Next in line is Piccadilly in central London. Wandsworth is waiting for the go-ahead.
The local worthies are lining up to consign the long lines of traffic snaking around town centres to the bin of history.