Possible special parameters

Special parameters are useful for many things …

The system_type=0 is ajusted as default (defined if system_type isn't used) and doesn't do anything special, just a normal way.

Adapted way type	System_type=	Description
track, monorail_track, road, maglev_track, narrowgauge_track, water	1	elevated way
track	7	tram way (same as waytype=tram_track)
track	255	unusable way (fence/pedestrian way/etc …)
air	0	taxiway
air	1	runway
water	255	river