Tbh i take the view that speed in and of itself isnt the problem, more going faster than the driver/cars ability and adding distractions/road hazards is the issue.
Bingo. We all know that, but unfortunately many of the people setting the limits are either 97 and have never driven, or are middle class middle-aged cyclists who think cars are evil and that Brake! is the answer. If we really wanted to improve road casualty rates we'd be better removing limits and dumping enforcement, putting the onus back into the driver's hands. Effectively, decriminalise / legalise 'speeding' but emphasise careless/dangerous driving laws and factor in better education and re-education. The speed camera / speed kills machine is a failure, which even government statistics bear out. Before the 85th percentile method of determining a road's speed limit was dropped, road casualties and fatalities dropped year on year for fifty whole years. After the speed kills lot came to the fore and cameras became 'the thing', suddenly - after fifty years of non-stop downward trend - road casualties started rising year on year.
If nothing else we should at least move back to using the 85th percentile for urban roads and make non-urban roads derestricted. The whole 'speed kills' message is skewed, uses bad science and outright fabrications, and just doesn't work. For example, the old 'Hit me at 30mph and there's an 80% chance I'll live. Hit me at 40mph and there's an 80% chance I'll die. Think! It's 30 for a reason.'. Well, yeah... But all this assumes the driver actually hits the victim at 30 or 40. In the real world people hit the brakes, and cars slow down very quickly indeed under an emergency stop. Real world government casualty statistics show the percentage of fatalities in all car versus pedestrian accidents hovers at a massively small 1.5% of victims for 20mph, 30mph and 40mph limits. It's a far cry from 80%, no? Don't forget this 1.5% includes suicides and those drunks/inattentives who literally step right in front of NSL vans and whatnot. It's almost as though the original speed isn't a factor, yet we still pootle around at 20 on wide open roads.
The police love to trot out the 'Fatal Four' line, yet their chosen sins (speed, phones, alcohol/drugs and seatbelts) are four of the lowest contributory factors in KSI accidents, or indeed in all accidents period. Speed is a factor (casting the net broad here, 'a factor' not even 'the primary factor') in a 'massive' 3-5% of accidents. Drink and drug driving, and mobile phone use, contribute to even less accidents (2-3%). That's from the police/government's own figures. Failing to look properly / not paying attention, meanwhile, is around 60-65% of KSIs accounted for. It's' a lot more work to pull over really dangerous drivers (tailgaters, lane hogs, dawdlers etc) and provide re-education than it is to sit in a van with a camera, though.
Don't forget, that low single-figure percentage of accidents where speed was listed by police as a factor includes all your Road Wars style high speed pursuits through town centres, joy riders, stolen cars, fleeing convicts and so on. Remove those people (who wouldn't obey a speed limit sign whether it said 5mph or 100mph) from the stats and focus on real world every day drivers doing real world everyday driving, and the figure shrinks even more.
Imagine any other area where someone would say 'Look, 95% of these deaths were caused by X, but 5% were caused by Y and Z. Let's spend a lot of money, and hit people hard, in pursuit of Y and Z. Screw X, who cares?'. It's ludicrous.
The late Steve Smith (an engineer) has a great website - kept live by his family and supporters) - with a ton of research and learning material related to traffic engineering and why speed cameras and limits are bad, which
you can read here. The Understanding section makes for interesting reading if you persevere through it all.
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