Unfortunately, you can also add better ambulance response times, highly trained paramedics, advances in A & E medicine - better survival rates from collisions.
Don't fool yourself. Apart from the reduction in casualties amongst car occupants due largely to vehicle design improvements (that you do mention), the rest of the reduction is largely due to less people walking and cycling, and less people letting their children walk and cycle alone. This results from their community roads having been engineered to give motor traffic de-facto priority - rather than providing an adequate motorway network and retaining community roads for true respectful "shared use".
Unfortunately, you can also add better ambulance response times, highly trained paramedics, advances in A & E medicine - better survival rates from collisions.
....and in probability, congestion and that people have become more used to having to interact with other road users.
-- Danny Colyer <http://www.redpedals.co.uk> Reply address is valid, but that on my website is checked more often "The plural of anecdote is not data" - Frank Kotsonis
I'm certain that so some called "traffic calming" makes the roads more dangerous to many due to the reactions that many drivers have to them.
What an appropriately timed post! I've just come back from a near miss in the company van where there are speed pillows just ahead of a blind bend. In a futile attempt to avoid the pillows, some drivers use the middle of the road - around said blind bend. The owner of the house by the bend has had fences replaced numerous times...
Wasn't it Barnet that experienced a 15% drop in road casualties following the removal of speed humps there?
Correlation does not imply causation.
Have pedestrians and cyclists been forced off the roads by the higher traffic speeds? Have Barnet's additional safety measures, such as improved pedestrian crossings, contributed to the reduction? Have air and noise pollution levels increased?
I'm sure the measures implemented by Brian Coleman are popular with some, but the man is a thieving crook who got himself a driving ban, yet expects London's taxpayers to foot his exorbitant £10k taxi bill. His childish tantrum over Connie Huq's endorsement of London Freewheel did him and his party no favours either.
Read John Adam's book 'Risk', about "Smeed's Law". See the section, "Safer Vehicles?", p137. Smeed plotted the number of accidents over time in various countries. They all followed much the same curve, although some climbed the curve at a later time than others. Thus Malaysia in 1980 is just like the USA in 1925. This seems to show that whatever the improvements were in road design and car design between 1925 and 1980, they didn't achieve much, if anything.
There were two exceptions: Over the years the Brit's have always been slightly safer than the curve shows they "should" be, and the Germans, slightly more dangerous.