All jammed up
The end of petrol rationing has brought back the traffic jam to our cities. Before long there will be complete congestion in some places.
One of the main causes of traffic jams is parked vehicles impeding flow. Another is a consequence of having so many intersecting roads. While science cannot stop people parking their cars, it can do much to improve traffic flow at intersections.
In the last 30 years automatic travel signals have revolutionised traffic control. First installed in Leeds, they were originally designed to work on a fixed time cycle. More recently, signals have been…
