§ 1623. Minimum sight distance.

(a)

Sight distance requirements at intersections and driveways shall be as required in table 16-4. The design speed for sight distance requirements at entrance intersections shall be the existing posted speed limit. Distances shall be measured from a point on the centerline of the entering road or driveway ten feet back from the edge of the nearest traffic way in the abutting street, and extending in both directions along the abutting street. Minimum sight distances shall be measured from the driver's eyes, which are assumed to be 3.75 feet in height above the pavement surface, to an object six inches high on the pavement in the center of every on-coming travel lane. The sight distance shall be clear along its entire minimum length and unimpaired by intervening changes in street grade, horizontal alignment or obstructions. Examples of obstructions are vegetation, ground cover, signs, existing topography, etc.

Table 16-4
Minimum Sight Distance Requirements

Design Speed (miles per hour)	Distance in Feet (Each Way)
25	125*
30	125*
35	150
40	185
45	230
50	475
55	350
60	450
65	550

 

*One hundred twenty-five-foot street spacing for internal residential streets only. Any external non-residential street spacing shall be a minimum of 150 feet.

(b)

Minimum sight distance requirements of this section may be designed in accordance with AASHTO's Geometric Design of Highways and Streets if such standards conflict with the requirements of this section.

(c)

See also standard drawings T-32 and T-33 in article 23 of this UDC.

(Ord. No. 17-003 , § 1, 10-2-2017)