Distinguish Service Roads from Parking Aisle

[tjvp]

I don't know the best way of doing this (color, thickness) but have them distinguished would be very helpful.

[bhousel]

Service roads with a special service=* tag are now drawn with a different color. This includes things like service=parking_aisle, service=drive-through, service=alley and probably some others I am forgetting.

I used the color #dcd9b9, which is the same color we use for highway=unclassified, but these service roads are drawn thinly. (Thick roads are for normal traffic, thin roads are for service traffic).

[bhousel]

Well, this is a surprise. A completely unintended, but useful, side effect is that now railways with a service=* tag (siding, yard, etc.) also use that same color #dcd9b9 for their stroke: