I can see the introduction of 20mph limits in parts of Portsmouth being at best a complete waste of time, and at worst cause an increase in accidents and convictions.
The emphasis by the police and the council will be in detecting drivers exceeding this unrealistically low speed limit, and ignoring all the other bad types of driving and road use that goes on. When drivers cause accidents it is usually due to lack of observation, concentration, anticipation and control. These factors are now totally ignored by the police, so the standards of driving have plummeted over recent years.
Most accidents involving pedestrians are actually the fault of the pedestrians themselves. Stepping out into the road without looking, ear attached to an iPod or mobile phone, all really basic stuff we were taught as kids. Cars hurt when they hit you, make an effort to avoid them.
I know Portsmouth quite well and I expect the limits to be concentrated around the narrower streets which are full of compact terraced housing and rows of parked cars on each side. Even if the limit was 100mph down these roads, drivers still wouldn’t go much faster than they currently do. There is simply too much too look out for such as on-coming vehicles to negotiate space with, badly parked cars, tight side roads and so on. In these sort of road drivers don’t travel quickly. But what they do need is 100% concentration on what is going on outside of their vehicle. An unreasonably low speed limit will be a distraction with the drivers eyes consumed with the speedometer and hidden speed traps. This cannot be good for safety.
Driving too slowly can also give a false sense of security for pedestrians, as they may start to take risks with cars that appear not to be perceptually moving, or can be heard to be moving. A certain amount of speed is required to make your existence known.
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