And what would be the downside of most of London being limited to 20mph? Compared to the massive benefit to pedestrians, cyclists, buses, the reduction in air and noise pollution and the reduction in fatal and serious injuries on the roads? I doubt the average progress of traffic through the capital is much faster than 20mph anyway.
Perhaps if the A1 was limited to 20 mph, then fewer commuters would choose to drive into town on it every day, again with huge actual benefits for those people who have to drive and to the city as a whole.
- More air pollution, not less - travelling slower means more fuel burnt and thus more pollution
- What massive benefit to cyclists etc - you assert people are already travelling at < 20mph, so the limit would have no effect
- What reduction in fatalities? Do you have any evidence that a lower speed limit results in less accidents/fatalities? Just to be clear, the data given at the start of this thread doesn't show that - it shows that *when a collision occurs* fatalities rise with speed, which is not really surprising. What it doesn't show is that a *speed limit* has any effect on fatalities.
Finally, you're confusing cause with effect. I doubt many of the people driving into work on the A1 actively want to be driving in - they'd all rather use their personal teleportation devices. However in the absence of these I suspect they'll continue to drive whatever the speed limit, since they still have to get to work.
Travelling slower does not mean more fuel burnt. When 30 kph zones were introduced in Germany, car drivers on average had to change gear 12% less often, use their brakes 14% less often and require 12% less fuel. You can read more about these studies here
Where cities have introduced a 20 mph limit, the UK Commission for Integrated Transport reported that they are transformed 'from being noisy, polluted places into vibrant, people-centred environments, with significant levels of walking, cycling and public transport ‘, with their associated health, environmental and social benefits.
My point about the A1 is that a lot of the people who choose to drive on it don't actually need to. Other options include public transport and car sharing. But people don't like to share their cars, and they don't like to use public transport, so they'd rather sit in a traffic jam and moan about how there's too much traffic on the road.
Permalink Reply by BBU on August 24, 2009 at 13:26
I'm not sure the 20mph limit would help, I'd like to know how many people currently stick to the 30mph limit in Haringey. I think we need a new speed hump design or vehicle speed limiters (like in an F1 pit lane).
Met a lovely man in Epping Forest who lives in Grove Park Road off West Green Road. He has brought up his family there and is now a grandad. They had their road converted to 20 mph a while ago after pressure from residents groups and he is now delighted as his grandkids play out in the road now, whilst his own children never did. Gets my vote.