My GPS provides a vehicle type "Emergency" in the route options. I think this is supposed to be used by ambulances police etc ...
Yes, but if you look back on the list for my earlier mutterings today, you will see that I discovered where the "delivery" and "emergency" bits really reside. So, we still have one spare bit (0x08) that must have some effect on the routing/access/something. I have tried setting that bit but mapsource doesn't appear to take any notice.
In the routing options on my etrex there are the following options: Type car/hgv/pedestrian/bike... Avoid - turnarounds - toll roads - highways - unpaved roads - carpool lanes As the flags for type, turnarounds, toll roads, highways should be known, the last bit could mean unpaved or carpool lanes. Have you tried this options? (By the way: 'Avoid Highways' does not work as expected on my unit, it leads to problems on inter tile routing.)