[Possible PATCH] render sides of barrier=guard_rail

[james2432]

Based on the description in the wiki: ​https://wiki.openstreetmap.org/wiki/Tag:barrier%3Dguard_rail

Right side of the way faces the road. Adding a styling to barrier=guard_rail that points to the inside, kind of like barrier=kerb (with little triangles) depending on the direction could greatly help drawing them.

[anonymous]

Easy to fix by using custom mapcss.

Position of triangles on inner guard rail side (inner surface is smooth).
Direction of triangles points usual to highway.

# cat custom-elemsyles.mapcss  
way[barrier=guard_rail] {
    repeat-image: "presets/barrier/kerb_pattern.svg";
    repeat-image-align: top;
    repeat-image-offset: 0.5;
}

[taylor.smock]

Taking a quick look at ​osmwiki:Tag:barrier=guard_rail, "[if] there is a clear inner/outer demarcation to the guard rail, construct the line so that the right side is inner and left side is outer."

How is no clear inner/outer demarcation indicated? How is the inner/outer demarcation indicated? Is there a sub-tag we should be using/encouraging?