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Posts tagged "Filtered Permeabilty"

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Cambridge: Britain’s Cycling Capital

In the city of Cambridge, just about an hour's train ride north of London, you'll find lots of people bicycling. In fact, the official bike mode share is 22 percent, but advocates believe it's even higher and could comprise up to 50 percent of all trips in the city center.

More than protected bike lanes, the key to Cambridge's success has been the management of motor vehicle traffic. For one, the city center is now ringed by a cordon of moveable bollards that only recede for buses, taxis, and some service vehicles. Private cars are not allowed downtown but people on bikes are free to enter at any time -- which makes the bicycle the most convenient mode of transportation.

In residential neighborhoods, Cambridge has also tamed cars using a strategy called "filtered permeability" -- placing physical barriers at some intersection that divert motorized traffic while allowing other modes to filter through. This prevents motorists from using residential areas as short cuts and encourages cycling. Similar techniques are employed in famous cycling cities like Groningen, Copenhagen, and Amsterdam, and even here in the U.S. in places like Portland and Berkeley.

Cambridge is a growing city, and if new residents choose to drive cars, its streets could become overwhelmed by traffic. So the effort to create better streets for biking and walking continues. Recently, the city has adopted a 20 mph speed limit for most of its roadways, and a new push is on to install much more robust protected bike lanes in targeted areas where cycling feels less safe.

For bonus footage of Cambridge streets, check my post from earlier this week.

StreetFilms
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Teasers & Bonus Videos from our upcoming Cambridge, UK Streetfilm!

In early August we'll be debuting an exciting new ten minute Streetfilm from Cambridge, UK. The city lies about an hour train ride north of London and is easily the highest mode share for bicycling in Britain: 22% of residents ride (though some say it's even higher than that.)  But the most fascinating thing is how the city has accomplished that without building a huge amount of protected bike facilities.

Instead they have achieved at least the atmosphere of safety by using many traffic management techniques - including a series of rising bollards that prohibits drivers without transponders (which are mostly on buses & cabs) from entering the city center - making it a better place to walk, shop, eat and bike. They have also done much work over the past decades around the idea of "filtered permeability", a process by which neighborhoods have had key intersections re-designed so that only people walking and biking can use them but vehicles need to go navigate around.

They've also recently begun converting most of their roads to 20 mph thanks to adopting the campaign by the organization "20 is Plenty for Us".  (On a side note we will have an updated Streetfilm on that organization up by end of summer!)  So enjoy these few bits we've posted here of various clips and extended bits that just didn't make it into the final film. Consider them just a small teaser of what you will be seeing in August!

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