Roadway Geometric Design: lane_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) |
|---|---|---|---|---|---|---|---|
| lane_width | lw_arterial | Lane width — rural arterial | AASHTO Green Book 7th Ed 2018 Table 6-5 | 12 ft preferred; 11 ft acceptable for arterials with posted speed ≤50 mph | ft | 11 | 12 |
| lane_width | lw_collector | Lane width — collector road | AASHTO Green Book 7th Ed 2018 Table 7-2 | 10-12 ft; 11 ft typical; 10 ft allowable with low truck volumes | ft | 10 | 12 |
| lane_width | lw_freeway | Lane width — freeway/interstate | AASHTO Green Book 7th Ed 2018; FHWA Green Book | Standard lane width 12 ft for freeways and interstates; minimum 11 ft for constrained NHS | ft | 12 | 12 |
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