Sections of typical four-lane road constructions
from: Alachua County Public Works
 
Fig 1. Too narrow. An 80 ft. right-of-way has no bike lanes and no separation of sidewalks and roadway
 
Fig 2. Minimal acceptable width. A 90 ft. right-of-way has bike lanes and separation of sidewalks and roadway.
 
Fig 3. Wider than needed. A 100 ft. right-of-way provides a wider median and more separation of sidewalks and roadway, and more room for utilities.