Then the busses can stay on the straight main roads while all the cars go get lost in the culled sacs, while people walking or on bike have direct paths.
Some studies show people will walk 3/4 of a mile, which is about 15 minutes. That's a "circle" that is 1.5 miles across, which is a an area of about 1132 acres (Ignore that straight roads don't have circles; pretend the "extra" area is support stuff, shops, whatever). 1132 acres of single family housing is 13,000 houses if "close", upwards of 20,000 units if we go to townhomes/rowhouses.
13k dwelling units all within a 3/4 mile walk from the edge; that should support at least one bus.