Hi Paul,
Using maps generated with r915 I've spent a while trying to route to places all over the UK. Places within my start tile work fine as expected.
Inter-tile routing works but I have the following observation
If you route to somewhere just inside the adjacent tile then the route selected is usually fine. If you route to somewhere deep inside the adjacent tile then the route chosen is far from optimal. It's as though motorways are being avoided until you are out of your starting tile after which the route takes the shortest path to a motorway and proceeds as expected. This seems to happen if travelling North, South or East (I'm not in a position to test West)
Similarly routing to places beyond adjacent tiles is not optimal but presumably this is due to the above e.g. going from Manchester to Taunton doesn't hit the M6 until near Stoke. After that it leaves the M5 north of Bristol, goes through the middle of Bristol and then rejoins the M5 but this is near the NW corner of one tile and the SW corner of another so I would expect oddities at this point.
The work that's been done so far on inter-tile routing is fantastic and I don't want anyone to think I'm having a go I just thought the info would be useful
Not for one moment, do I think you're "having a go" - the feedback is really useful to have. Here's a thought off the top of my head. For optimal routing over long distances, could the map also contain tiles that cover a larger area but with less detail? Steve, Robert any thoughts on that idea? Cheers, Mark