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Update on 20mph zones in London

We posted before about data on 20mph zones in London, using numbers from this 2008 TfL report. TfL have now responded to an FOI request with updated data on 20mph zones. You can download the data in .xls format from the TfL response, but we have done a couple of charts summing up the overall London trend and a borough comparison below.

This chart shows that the last two years (2008 to 2010) have seen a particularly large increase in the total length of streets in 20mph. By 2010, nearly 2,800 km of London streets were in 20mph zones, 18% of the total.

This chart shows the proportion of streets/roads in 20mph zones in each London borough in 2008 and 2010. There is huge variation between boroughs, with a general pattern of East London boroughs tending to have more 20mph zones. Nearly every borough has increased their 20mph zone coverage since 2008, with the interesting exceptions of Hackney and Tower Hamlets.

Note: the TfL data gives a zero figure for 20mph in the City of London, but a dash (-) in the cases of Westminster and Kensington and Chelsea. However, as far as we can tell there aren’t any 20mph streets in either of those boroughs, so we’ve put them in as zero for now, with the proviso that it sounds like Exhibition Road (which has stretches in both boroughs) will be 20mph when its refurbishment is complete.

Finally, don’t forget you can see a map of streets in 20mph zones in London here. It would be nice if this were available as an overlay for mapping services like Google Maps and OSM …

Filed under: 2010, Boroughs, London, Speed, TfL

4 Responses

  1. BeachedBum says:

    Is it possible to correlate this data with levels of cycling and walking? It would really help provide evidence of the health benefits of 20mph limits…

  2. Jim says:

    Yes, that should be possible, though it’s not something we’ve tried to do, and I imagine it may take some time for the effects of 20mph zones to show up in cycling or walking rates.

  3. […] of streets in London (2,800 km) have a 20 mph max speed limit. That’s 32 kph. The trend is […]

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