This one time, at band camp, IvorW wrote:

My thoughts about this are to have a new type of node called a route. Such nodes contain a list of (x,y) or (lat,long) pairs tracing a route. These are joined together by straight lines when displaying on SVG or suchlike.

Sounds similar to an idea I had for when you're going on a journey and want to find all the stuff that is within a range of your route. Ideally upload your MS Autoroute or GPS route waypoints?

This idea would be great for my site. Geek goes on holiday with non-geeks and non-geek agenda. Geek puts in route to find where the group's plan can be merged with some geek sites to see :)