Collector Roads (Yellow) average 0-2 ft. shoulder widths
Arterial Roads (Green) average 4-8 ft. shoulder widths
Your route rating is calculated by determing what type of road the majority (>50%) of your journey is on. If the majority is on Arterial roads you will receive an A rating. If the majority is on Collector roads you will receive a B rating. More road information and additional datasets will enable more precise ratings for future upgrades to this map.