This is one of those things that now you've seen it you'll start to notice just how bumpy the world is! I know I didn't give any of this stuff a second thought until quadriplegia meant I became a full-time wheelchair driver.

Ramps on the front of buildings and internal step free access in modern buildings is absolutely wonderful, but unless every metre of a journey from where I am now to where I want to go is accessible then none of it is accessible.

The signal cannot carry.

For example where we used to live it was impossible for me to turn left out of my house at the beginning of any journey, it did not matter how much I tried to reason with thay nine inch high curb just would not smooth out. And that is it, that whole part of my neighbourhood was cut off because the engineers putting in dropped curbs have not seemed to fully grok the reason for dropped curbs.

This kind of mapping is absolutely invaluable and has to be kept in the open source world I think, that does not mean people should not make money from it but this is one of those things where crowdsourcing could really speed up the process considering we are all carrying around incredibly sophisticated geospatial mapping devices containing accelerometers, GPS and all the other bits and bobs needed to quickly map an area.

Hit me up if any of you want to collaborate on a project like this in the UK.