Example 1 A car is traveling at 30 mph in the country at night on a wet road through a 150 ft. long sag vertical curve. The entering grade is -2.4 per
{"Image DocumentName": "Example 2 Similar to Example 1 but for a crest curve.", "Image ImageDescription": "A car is traveling at 30 mph in the country at night on a wet road through a 150 ft. long crest vertical curve. The entering grade is 3.0 percent and the exiting grade is -3.4 percent. A tree has fallen across the road at approximately the PVT. Is it reasonable to expect the driver to be able to stop before hitting the tree? Assume that S>L (it usually is), therefore SSD = ft. which is greater than L. The driver will see the tree when it is feet in front of her. Available SSD = ft. Required SSD = (1.47 x 30)2/2(32.2)( ) + 2.5(1.47 x 30) = ft. Therefore, she will be able to stop in time. OR. L/A = K = 150/6.4 = 23.43, which is greater than the required K of 19 for a 30 mph design speed on a crest vertical curve. Stopping sight distance on level ground at 30 mph is approximately 200 ft.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}