It should be deleted!
The spacing of street trees needs to be governed by the size of the tree. Where property frontages are wide and the mature height of the tree is not particularly big (eg WA Peppermint), you may need two or even three trees per frontage to make a strong streetscape.
This photo shows what happens when you plant one (small) tree per (large) frontage.
|Kingsland Ave, City Beach (click photo to enlarge)|