Northern Light
Superstar
^The issue of over-paving is important. How much heat sink and water runoff could we address as we resize roads? Local (ie residential) roads need to be kept narrow to induce slower driving, many are wider than they need to be. Maybe that means more lawn, not less.
This point probably overlaps with Vision Zero, but the geen impacts of road construction ought to be part of that discussion, and vv.
- Paul
Many side streets, especially outside the core, can and should be narrowed. For sidestreets in the core, typical curb to curb is 7m; but in inner burbs its 11M+
That 'extra' space could be added back to front yards or could be served up as tree-lined boulevards.
Given a desire to shade the paved road to keep heat down, to provide good growing conditions for trees and avoid tree-building conflicts, I would generally lean to the boulevard option, but I think it can vary by situation.
The default here is to grass a boulevard, but that need not be the case.
There are any number of plants (many native) one could choose instead to go under the trees.
Sedges are an obviously choice, as they look similar to grass, but will cap out around a 20-30cm high; they will look after themselves, hold the ground and typically can handle a few people walking over them.
Pennsylvania Sedge (from https://www.tnnursery.net/pennsylvania-sedge-for-sale/)
Zigzag Goldenrod is a nice flower in the late summer but will hold the ground with greenery much of the rest of the time, and is a good performer in shade.
(from: http://afors.org/wp-content/uploads/2014/04/City-of-Saint-Paul-Rain-Gardens.pdf
Wild Geranium could be nice too, it gives spring flowers in May, but nice green ground cover thereafter.
Interesting to note the City of Saint Paul actually has a program where the City puts in natural, non-lawn boulevards on residential streets.
They have both sun and shade versions.