Hi I was meaning to write a message about this for a while and since the thread for drive-on-left/right has brought this up already today and since it is a mkgmap birthday (8 years!) this might be a good time to set the ball rolling. Currently we use rectangular tiles, but it is perfectly possible to have arbitrarily shaped tiles - in particular tiles can be shaped to exactly follow a country border or be conveniently split by straight lines between countries separated by sea. This means that every rule could be customised for each country. This is probably the biggest feature that we don't have that we can achieve with what we know about the format. I am sure that it can be done, but it is a large task and will need more than one person working on it. If there is any interest I shall outline my thoughts tomorrow. ..Steve