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On Ridge Road looking onto McDaniel Road |
Community Development Code |
AASHTO (Per CDC 501-8.1 B(2)(d) and 8.2 B(3)) |
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| Required | Actual | Required | Actual | |
| Looking north at southbound traffic | 350 ft | 385 ft | ||
| Looking south at northbound traffic | 380 ft | 320 ft | 263 ft | 320-334 ft |
Sight distance looking south at northbound traffic does not meet the criteria in Community Development Code Section 501-8.5 F (4). However, stopping sight distance is met using the American Association of State Highway and Transportation Officials (AASHTO) 2018 "A Policy on Geometric Design of Highways and Streets" formula, which includes the distance for an approaching driver to perceive and react to a condition plus the distance for the oncoming vehicle to come to a complete stop. The AASHTO formula takes into account the site-specific conditions; the criteria in CDC 501-8.5 F (4) are more generic in its application.
The standard formula for stopping sight distance (SSD) = 1.47Vt + V2/{30[(a/32.2)+/-G]}
Based on the above equation, the recommended stopping sight distance for a vehicle traveling northbound along NW McDaniel Road at 38 mph is 263 feet, based on 85th percentile speed. The visibility of 320 feet for an eye position at 15 feet back and 334 feet at an eye position at 10 feet back exceeds this required minimum stopping sight distance for the 85th percentile speed.
The actual field-measured sight distance is 30% greater than the minimum required stopping sight distance per AASHTO. As a result, CDC Sections 501-8.1 B (2) (d) and 8.2 B (3) criteria are met. Public safety is preserved at the intersection without the fire gate.
