If you have ever been to the Schönbrunn Palace as a tourist, chances are that you rode the U4 line to the Schönbrunn station and walked some distance down the Schönbrunner Schlossstrasse to the front entrance under the towering chestnut trees that line the allee, and were perhaps told that Maria Theresia had them planted as a boon for the poor of Vienna. This is not, as it turns out, quite the case. Ideally, this is how all roads are suppposed to look, at least in the 1740s and through at least the 1890s.
This allee shows that ideal arrangement, with a raised, graded and surfaced roadbed, flanked by open drains separating the road from two parallel sidewalks. At the edge of the work, saplings are planted. And while the engineer will wax poetic about shady rests, the prosaic truth is that the trees are intended to put down roots and stabilise the flanks of the roadbed, as well, as it turns out, to serve in lieu of a guard rail, preventing wagons and coaches from veering from the road and rolling. The advantages of planting a mast tree, once you have started out down this road, is obvious enough. Everyone's got to eat!