"Great Streets", Allan B. Jacobs, p294 (The MIT Press)
Here's a good local example of what Jacobs is talking about:
|Centro Ave, Subiaco (click to enlarge)|
* When Jacobs says the leaf patterns of non-deciduous trees are "almost always less dense than those of non-deciduous trees" he is referring to northern hemisphere evergreens - conifers basically. Our large Eucalypts (evergreen) don't have these dense leaf patterns but do have other issues when
used as street trees.