[dt7]

This could actually have a very helpful application- generating maps with customised colour schemes. Anyone with a form of colour blindness will know that some of the lines on the standard map are basically indistinguishable from each-other, and while TfL does provide a black-and-white map, it's designed for ALL forms of colour blindness, so they've had to come up with a load of different patterns, making it a bit messy (http://www.tfl.gov.uk/gettingaround/14091.aspx).

With this CSS map a user could customise the colour/pattern of just a couple of problem lines (I could already in Firebug, but it would be great if there was a control panel to fiddle these things and then provide print/save links). Just an idea!

[nkorth]

Actually, SVG can use "classes" just like CSS, so it could be easily recolored in SVG too.

[dt7]

I suppose the main thing you'd need is a data source mapping the stations and lines, then build it in whatever technology from that. The information page doesn't mention where the data came from, so I imagine it was manually created. I don't think TfL would be too willing to provide that data either, judging by the comments regarding licensing etc. in this thread.