Roadway Geometric Design: shoulder_width
AASHTO Green Book 7th Edition (2018) roadway geometric design standards — stopping sight distance (15–80 mph), passing sight distance (20–70 mph), minimum horizontal curve radius by design speed and emax (4%/6%/8%), K-values for crest and sag vertical curves (25–80 mph), maximum grade limits by terrain type (level/rolling/mountainous) and road class (freeway/arterial/collector/local), superelevation standards, lane and shoulder width standards, and design vehicle dimensions (P, SU, WB-40, WB-62, WB-67).
| parameter type | record id | description | notes | unit | value max (varies) | value min (varies) | value typical (varies) |
|---|---|---|---|---|---|---|---|
| shoulder_width | sw_arterial | Shoulder width — rural arterial | AASHTO Green Book 7th Ed 2018 Table 6-6 | 6-10 ft depending on traffic volume and truck % | ft | 6 | 10 |
| shoulder_width | sw_collector | Shoulder width — rural collector | AASHTO Green Book 7th Ed 2018 Table 7-2 | 2-8 ft; higher end for paved shoulders on higher-volume collectors | ft | 2 | 8 |
| shoulder_width | sw_freeway_right | Right shoulder width — freeway | AASHTO Green Book 7th Ed 2018; FHWA Interstate Design Standards | 12 ft preferred; 10 ft minimum for right shoulder; 4-6 ft minimum for left (median) shoulder | ft | 10 | 12 |
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