- CmdConvertRoad
- upgrade subtype when adding roadbits only if compatible
- drawing of catenary continuation
- manual tram reverse at incompatible tramsubtype ?
- yapf
- npf
- autoreplace list filter
- toolbar insensitive if no type available
- roadtype strings
- curve_speed
- max_speed
- map_colour
- introduction_*
- default roadtype availability and town road construction
- script api