[mkgmap-dev] Reduce road class/speed when road is narrow

Mon Oct 12 23:03:52 BST 2009

On Oct 12, 2009, at 17:12, Mark Burton wrote:

>
> I want to dissuade my gps from using very narrow roads (for car  
> routing)
> so one way of doing that is to reduce the road class and/or speed if  
> the
> road is narrower than some threshold. I can easily imagine how to do
> that in mkgmap using some new Java code but I suspect that it could be
> done using style rules (of which I know nothing). Is that possible?

I suspect you could do it with something like the following:

highway= primary & (width=narrow | width < 2 | est_width < 2) [0x04  
road_class=2 road_speed=3 resolution 20]

highway=primary [0x03 road_class=3 road_speed=4 resolution 19]

(This would demote a primary road to the equivalent of a secondary.)  
I, however have not tested this, so I cannot confirm if this would work.

Cheers.