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A. Vertical Alignment. Unless granted a variance by the planning commission, roads shall be constructed in a manner such that grades shall not exceed 10 percent and crossroads within 20 feet of a through-road intersection shall not exceed four percent grade.

B. Horizontal Alignment. Roads shall be constructed along the centerline of the right-of-way and shall have curves meeting the minimum radius requirements of not less than 300 feet for rights-of-way, 100 feet in width or more, and not less than 200 feet on all other roads.

C. Clear Zone. The roadside shall be clear of hazardous objects or conditions for a distance consistent with speed, traffic volume, and geometric conditions of the site. Roads shall be constructed with a minimum clear zone of six and one-half feet. Where hazardous physical features exist which cannot be located outside of the clear zone, alternative treatments such as guardrails may be required.

D. Culs-de-Sac (Turnarounds).

1. Roads designed to have one end closed permanently shall be no longer than 500 feet from the center of the intersection to the radius point of the cul-de-sac, and shall terminate with a turnaround having at least a 100-foot-diameter right-of-way and a roadway at least 75 feet in diameter. The turnaround shall be constructed to a four percent grade or less.

2. Temporary roads longer than 500 feet may be constructed with one end closed with a conditional use permit approved by the planning commission. A conditional use permit may be granted with a minimum of the following criteria:

a. The road shall terminate with a turnaround having at least a 100-foot-diameter right-of-way and a roadway at least 75 feet in diameter. The turnaround shall be constructed to a four percent grade or less.

b. The developer shall post a performance bond.

c. The planning commission shall set an expiration date for the conditional use permit.

E. Intersections. A minimum unobstructed sight distance of 150 feet shall be provided unless a variance is granted due to topography, traffic flow or other physical characteristics. Appropriate warning signs may be required if an exception to the sight distance is granted. Road intersections shall be constructed with a minimum return radius of 20 feet. (Ord. 10-07-235 § 4; Ord. 08-03-180)