Road edge description
There should be an entry describing the limits of usable space on a road; depending on the nature of some lane surfaces, the usable space may not be equivalent to the sum of the lanes. An explicit border / edge entry would make it easier to describe the "tunnel" that is available on a given road.
#1 Updated by Marius Dupuis about 1 month ago
I propose to describe this as roadmark information; with the lane border nodes, it is easy to describe outlines of lanes; so it should not be difficult to have one such outline and add the roadmark type "edge" to it on either side of the road.