{"id":3332,"date":"2024-08-30T17:38:11","date_gmt":"2024-08-30T12:08:11","guid":{"rendered":"https:\/\/study.madeeasy.in\/?p=3332"},"modified":"2025-07-16T14:59:39","modified_gmt":"2025-07-16T09:29:39","slug":"length-of-summit-curve","status":"publish","type":"post","link":"https:\/\/www.madeeasy.in\/study\/ce\/highway-engineering\/length-of-summit-curve","title":{"rendered":"Length of Summit Curve"},"content":{"rendered":"

For summit curve, the most important consideration in determining length of curve is requirement of sight distance. Length of summit curve depends on whether sight distance is lesser or greater than length of curve.<\/p>\n

Length of summit curves for both cases are given below<\/h2>\n

Case 1 :<\/strong> Consider a summit curve as shown in figure below.\"Summit<\/p>\n

(a) If stopping sight distance, i.e., SSD is used as a sight distance, then
\nh1<\/sub> = 1.2 m and h2<\/sub> = 0.15 m.
\nPutting the values in above equation, we get<\/p>\n

Ls = NS2<\/sup> \/ 4.4<\/p>\n

(b) If overtaking or intermediate sight distance, i.e., OSD or ISD is used as a sight distance, then
\nh1<\/sub> = 1.2 m, h2<\/sub> = 1.2 m.
\nPutting values in above equation, we get<\/p>\n

Ls = NS2<\/sup> \/ 9.6<\/p>\n

Case 2 :<\/strong> When length of curve is less than sight distance S provided on the road.<\/p>\n

\"Sight\"Summit<\/p>\n

(a) If stopping sight distance is provided on road, then h1 = 1.2 m, h2 = 0.15 m. Putting values in eqn. (iv), we get<\/p>\n

Ls = 2S – 4.4\/N<\/p>\n

(b) If overtaking or intermediate sight distance, i.e., OSD or ISD is provided on road, then h1 = 1.2 m, h2 = 1.2 m. Putting values, we get<\/p>\n

Ls = 2S – 9.6\/N<\/p>\n

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