A few feet from the cycling lane traffic moves at speeds of between 30 miles per hour, the speed limit for arterials in Seattle, and 40 miles per hour, the speed at which many cars actually travel.

自行车车道离机动车道仅有几英尺，机动车规定速度必须保持在每小时30英里，这是在西雅图干道上的速度限制，但实际上许多车辆都是以每小时40英里的速度行驶的。

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The London Cycling Campaign - one of the backers of the Blackfriars Bridge flashride - has been arguing for a 20mph limit at Blackfriars to reduce road danger and help meet the mayor's aspirations to turn London into a cycling city.

BBC: TfL plans for Blackfriars Bridge spark cyclists protest

The council has said the speed limit would make the roads less dangerous and encourage walking and cycling.

BBC: South Bristol 20mph limit to be rolled out in 2014

It believes the 20mph limit would reduce the number and severity of road crashes, improve air quality and encourage more cycling and walking.

BBC: Brighton's 20mph city-wide road plan gets support