Roadway Geometric Design: max_grade
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) |
|---|---|---|---|---|---|---|---|
| max_grade | grade_arterial_level | Max grade — rural arterial level terrain | AASHTO Green Book 7th Ed 2018 Table 6-2 | Rural major arterial; level terrain | % | 5 | 5 |
| max_grade | grade_arterial_mountain | Max grade — rural arterial mountainous terrain | AASHTO Green Book 7th Ed 2018 Table 6-2 | Rural major arterial; mountainous terrain; higher grades permitted | % | 8 | 8 |
| max_grade | grade_arterial_rolling | Max grade — rural arterial rolling terrain | AASHTO Green Book 7th Ed 2018 Table 6-2 | Rural major arterial; rolling terrain | % | 6 | 6 |
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