[mkgmap-dev] Routing and tunnels

Tue Dec 11 18:18:14 GMT 2012

> Thanks Minko, I guess that is why the bridge worked - it was always an
> overlay. Is there anywhere to say which codes are routeable, or is it
> try it and see (I guess it needs to be a low number).

As far as I know only these are routable (except 0x14?)

R Hex    Description
Y 0x01 1 Major Highway-thick
Y 0x02 2 Principal Highway-thick
Y 0x03 3 Principal Highway-medium
Y 0x04 4 Arterial Road–medium
Y 0x05 5 Arterial Road-thick
Y 0x06 6 Road-thin
Y 0x07 7 Alley-thick
Y 0x08 8 Ramp
Y 0x09 9 Ramp
Y 0x0a 10 Unpaved Road-thin
Y 0x0b 11 Major Highway Connector-thick
Y 0x0c 12 Roundabout
N 0x14 20 Railroad
Y 0x16 22 Track/Trail
Y 0x1a 26 Ferry
Y 0x1b 27 Ferry

So you can also pick one of the routable lines you don't need and use it for tunnels.