Short-sighted solutions tend to focus on bridges, flyovers and roads to ease congestion.
But constructing road bridges, flyovers or tunnels on virgin railways poses a different challenge from trying to reconcile the flat East Anglian landscape and its old market towns with the desire for faster trains.
By 1963, when Macmillan stood down, Marples had planned and started to build a full-scale national network of motorways, with a comprehensive programme of new bridges, flyovers and service stations.
Civil engineers focus on structures and facilities such as transportation routes, features (tunnels, bridges, flyovers), and hubs (such as airports and bus interchanges), water treatment (sewage, dams, pipelines, etc).
Sex can be bought for less than £1 ($1.60) under a bridge or flyover in Sichuan.
Community groups are working with Stormont departments to restore the famous lyrics at the Bridge End flyover.
In Nairobi, traffic was snarled as Chinese construction firms built a new highway network, complete with bridges and flyovers to speed traffic across the city.
The Mabey companies have previously been accused by anti-corruption campaigners of overcharging for sales of bridges and flyovers in the Philippines and Papua New Guinea.
On August 30, David Mabey got the UK government's signature on a further £90m loan guarantee, to provide bridges and flyovers on credit.
So in the toll booth problem, when you're putting tolls on roads or more generally, when you're building new roads, new bridges, new flyovers, new bypasses, you need to take into account how those new tolls, how those new roads will affect all of traffic flow.
