Reduce number of Table A entries. Previously, Table A entries were unique for each combination of start node, end node and RoadDef. But no information from the start and end nodes goes into Table A so we can ignore the start and end nodes and all roads within a given routing centre that use the same RoadDef can now share a Table A entry. This reduces the number of entries required which makes the .img files smaller and, hopefully, also improves the routing because routing centres can now cover a larger area. I have tested this with mapsource and on a Nuvi and it appears to work OK but it really needs more testing before it could be considered for committing. So, all feedback is welcome regarding the effect this patch has on routing performance. With the patch, the routing changed and I thought it was more sensible but perhaps that's just wishful thinking. My GB map shrunk from 180 to 174 Mb with this patch. The Nuvi calculated a route from Lands End to Thurso (800+ miles and quite a few tiles) in no more than 10 seconds. Cheers, Mark