Wales becomes Trumpton

"The role of speed in crash likelihood has been confirmed through numerous studies. For example, Nilsson (2004) and then Elvik (2013) demonstrated that lower mean traffic speeds in response to speed limit reduction result in reduced likelihood of casualty crashes. Kloeden (2001, 2002) presented relationships demonstrating that the likelihood of driver involvement in a casualty crash increased with his or her speed over the speed limit. Much of this research points to the fact that even small reductions in speed can lead to considerable reductions in road trauma. "

 
"A higher speed increases the likelihood of an accident. Very strong relationships have been established between speed and accident risk"

road-safety.transport.ec.europa.eu

Speed and accident risk

Speed and...
road-safety.transport.ec.europa.eu road-safety.transport.ec.europa.eu
 
motorbiking said:
See it all the time and more often than not the car is unmarked.
Click to expand...
I would take a safe bet that you've seen less accident damaged cars than me.

Want to discuss impacts and damage and speeds ?

A head makes a big mess of a car in 30 limits. A car makes a big mess of a body too
 
denso13 said:
"The role of speed in crash likelihood has been confirmed through numerous studies. For example, Nilsson (2004) and then Elvik (2013) demonstrated that lower mean traffic speeds in response to speed limit reduction result in reduced likelihood of casualty crashes. Kloeden (2001, 2002) presented relationships demonstrating that the likelihood of driver involvement in a casualty crash increased with his or her speed over the speed limit. Much of this research points to the fact that even small reductions in speed can lead to considerable reductions in road trauma. "

Click to expand...
impact speed... again.
 
"Secondly, in obedience to the laws of physics, speed makes crashes more severe. This is particularly important in cities, towns and villages, where pedestrians are particularly at risk. The Royal Society for the Prevention of Accidents informed us that:

"Hit by a car at 40 mph, nine out of ten pedestrians will be killed.

Hit by a car at 30 mph, about half of pedestrians will be killed.

Hit by a car at 20 mph, nine out of ten pedestrians will survive.""

 
carmanmemoranda said:
I would take a safe bet that you've seen less accident damaged cars than me.

Want to discuss impacts and damage and speeds ?

A head makes a big mess of a car in 30 limits. A car makes a big mess of a body too
Click to expand...
Again... Impact speed.
 
denso13 said:
"Secondly, in obedience to the laws of physics, speed makes crashes more severe. This is particularly important in cities, towns and villages, where pedestrians are particularly at risk. The Royal Society for the Prevention of Accidents informed us that:

"Hit by a car at 40 mph, nine out of ten pedestrians will be killed.

Hit by a car at 30 mph, about half of pedestrians will be killed.

Hit by a car at 20 mph, nine out of ten pedestrians will survive.""

Click to expand...
impact speed... again (yawn).
 
What are some asserting in this thread? That speed limits should be scrapped? That drivers should be allowed to use their own judgment and skill to determine how fast or slow they should be going? Joking aside, I'm not sure what point some are trying to make.
 
The introduction of 20 mph zones was associated with a 41.9% (95% confidence interval 36.0% to 47.8%) reduction in road casualties, after adjustment for underlying time trends. The percentage reduction was greatest in younger children and greater for the category of killed or seriously injured casualties than for minor injuries. There was no evidence of casualty migration to areas adjacent to 20 mph zones, where casualties also fell slightly by an average of 8.0% (4.4% to 11.5%).

www.bmj.com

Effect of 20 mph traffic speed zones on road injuries in London, 1986-2006: controlled interrupted time series analysis

Objective To quantify the effect of the introduction of 20 mph (32 km an hour) traffic speed zones on road collisions, injuries, and fatalities in London. Design Observational study based on analysis of geographically coded police data on road casualties, 1986-2006. Analyses were made of...
www.bmj.com www.bmj.com
 

Conclusions
Our findings showed that a city centre 20 mph intervention had little impact on long-term outcomes including road traffic collisions, casualties and speed, except for a reduction in traffic volume. Future 20 mph speed limit interventions should consider the fidelity, context and scale of implementation.
 
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