Stopping Sight Distance (SSD) on Vertical Curves. A particular crest vertical curve (VC) on SR361 between Middletown and Shoridan has long been criticized as being unsafe. Its length is 400 feet. The prevailing speed on the crest VC is 50 mph. In its present condition, its tangent grades are G1 = +2 percent and G2 = −3 percent. Does the crest VC meet minimum SSD standards? Because of a grant from the Governor’s Flighway Safety Initiative, it will be possible to enforce a speed limit of 45 mph on the crest VC. Will the VC meet minimum SSD standards if speeds can be limited to 45 mph?
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