[mkgmap-dev] Hiding long tunnels from map view while keeping them routable

Tue Oct 20 08:47:20 BST 2015

On Tue, Oct 20, 2015 at 12:03:52AM -0700, GerdP wrote:
>Esp. the tags which express a planned (or not yet planned) status are 
>problematic, they may be non-existent bridges or tunnels.

Speaking of tunnels, would it be technically possible to hide tunnels 
from the map view, while keeping them in the routing graph? This could 
be useful in urban areas. A few years ago, I added rules to hide 
unrouteable tunnels, such as highway=service,access=private, or railway 
tunnels (subways).

A separate discussion is whether it is practically feasible to hide such 
tunnels from the map display in the default style. In my opinion, it 
would be. As long as the tunnel exists in the routing graph, it can be 
used for routing (typically, for cars only). Pedestrians and bicyclists 
or anyone who is at the street level would not be confused by seeing the 
map cluttered with the "bogus" road.

Best regards,

	Marko