Allagan Technological level, architecture?

[Shadygrove]

Those roads may bear those names - but may not have been built by the Allagans themselves - they may have been built by civilisations that came later, in an effort of trying to recapure some of the Allagan glory by naming the roads thusly.

If you want a real life example, you only need to look back to the height of the Roman Empire.

If you want a real life example you needn't look any further than El Camino Real in California.

Been a long time since it was named. Nothing of the original dirt path remains. But the name does.