The commentary by Mark Whitby (NCE 5 April) should be welcomed for bringing an element of analytical logic into a matter about which many have but a subjective view.
It is obvious that if all vehicles are stationary there would be no crashes, while all should remember the carnage that resulted in the removal of all speed limits, for albeit a very short time, some 70 years ago.
However, it is not just personal survival that is dependent on the speed of traffic. It is proved that the consumption of fuel and hence the emission of pollutants is very dependent on both the speed of the vehicles and the rotational speed of the engines which drive them.
It is to be hoped that eventually lower speed limits will be generally accepted, not as a criticism of the abilities of the individual driver, but as an essential for the safety and well being of the whole world.
R Cooper (M), Durham Lodge, 167 Coulsdon Road, Old Coulsdon, Surrey CR5 1EG.