Suppress Railings When Crossing Other Roads

[HoratioGamer]

In the HighwayTools module, it would be convenient if Lambda would detect road-level obsidian to the left and right of the schematic it is about to apply, and instead of putting in guard rails 1 block higher than the road bed, lower the guard rails to road bed level -- this would make HighwayTools automatically make intersections properly. I am finding a lot of intersections where people have AFK-repaired the cross-highway (HighwayTools is excellent at removing grief AFK), and left an obsidian curb across the highway I am on -- essentially automatically griefing it.

This change would cause HighwayTools to stop griefing cross-roads, and repair griefed intersections.

It would also have the effect that on super-wide highways like those inside 5k, it would not make any guard rails at all -- one could AFK degrief these highways.