logo separator

Exit hints

25
Jan

There is a new feature to help creating rules in the style file that help with writing style rules that give a bit more help about motorway exits.

The default style is not affected, this is for style authors to use in their styles. It may not work the same on all devices, so you should experiment with the results.

Usually Garmin devices do not display the name of the exit on motorways while routing with mkgmap created maps. The new feature allows you to create a style rule that names part of the exit link road with the junction number, so that when the device tells you to turn onto that road it will include the junction number.

To make this work you have to specify the --process-exits option. This works by splitting each motorway_link into three parts. All parts are tagged with the original tags of the motorway_link. Additionally the middle part is tagged with the following tags:

 mkgmap:exit_hint=true
 mkgmap:exit_hint_ref=ref # tag value of the motorway exit
 mkgmap:exit_hint_name=name # tag value of the motorway exit
 mkgmap:exit_hint_exit_to=exit_to # tag value of the motorway exit

Adding a rule checking that mkgmap:exit_hint=true makes it possible to use Garmin type 0x01 (motorway) for the middle part so that the Garmin device displays the name of this middle part as a hint where to leave the motorway.

An example of such a rule is given below.

highway=motorway_link & mkgmap:exit_hint=true
   { delete display_name;
     name 'Exit ${mkgmap:exit_hint_ref} ${mkgmap:exit_hint_name}' |
          'Exit ${mkgmap:exit_hint_ref} ${mkgmap:exit_hint_exit_to}' |
          'Exit ${mkgmap:exit_hint_exit_to}' |
          'Exit ${mkgmap:exit_hint_name}' |
          'Exit ${mkgmap:exit_hint_ref}' }
    [0x1 road_class=3 road_speed=2 level 1]
Posted by steve on 25 Jan 2013

Latest commits

  • mkgmap-r4288 Improve log message when route restriction when via node is not a routing node..
    01 aug 2019
  • mkgmap-r4287 simplify code, no functional change.
    05 jun 2019
  • mkgmap-r4286 mdr5.patch by Ticker Berkin:.
    16 apr 2019
  • mkgmap-r4285 add tag mkgmap:way-length for each POI generated from a line when option --add-pois-to-lines is used. It gives the way length ....
    07 apr 2019
  • mkgmap-r4284 let test-map:all-elements set the transparent flag, use 0x1b instead of 0x51 for background.
    27 mar 2019
See more...