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The type of transition curves generally provided on hill roads, is ________(a) lemniscate(b) cubic parabola(c) circular(d) spiral |
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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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