The type of transition curves generally provided on hill roads, is ________(a) lemniscate(b) cubic parabola(c) circular(d) spiralThe question was posed to me in semester exam.This intriguing question originated from Detailed Specifications of Road Work topic in section Specifications, Estimation of Quantities of Materials and Transport of Civil Engineering Drawing

The type of transition curves generally provided on hill roads, is ___

1.	The type of transition curves generally provided on hill roads, is ________(a) lemniscate(b) cubic parabola(c) circular(d) spiralThe question was posed to me in semester exam.This intriguing question originated from Detailed Specifications of Road Work topic in section Specifications, Estimation of Quantities of Materials and Transport of Civil Engineering Drawing
Answer» The CORRECT CHOICE is (d) spiral For explanation I would say: In case of transition curves, if traffic condition is mixed then provision of speed is limited to 60% of max. Speed of vehicle. One side of curve will higher then the other side for the case of accident of traffic. Ideal Transition curve: Spiral or clothoid (Lemniscate for MODERN roads). Valley curve: Cubic PARABOLA. Vertical curve: Parabola.

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