D
Deleted member 15344
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A few issues. Car speedos over-read speed, so when your indicator says you are doing X you are almost always doing less, but never doing more. Hence the margin for error.
The basic concept of speed limits is a perfectly reasonable one, but it is distorted by local councils attempts to raise money (although that is now changing) and NIMBYs who have pull with a local council and get their part of the road designated as a 30 when it really does not need to be, and it sits in between sections of 40 or 50 providing nice little speed traps. These areas do nothing to promote road safety.
Slow driving causes many accidents by causing clumping of traffic, and MPVs with mothers more interested in looking into the back to tell off the kids off and causing other cars to swerve. These culprits are usually not in the accident but just leave the trail of destruction behind them.
The changes off speed limits are now done in conjunction with the Highway Agencies using previous collision reports and risks
Areas get reduced speed limits and speed cameras due to previous accidents over a 3 year and then monitored again for 3 years
If an area is a 30 or a 20 it's because there have been previous incidents and there is risk of more collisions unless the speed is culled
The days of making money for councils have been gone for a number of years now