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Q1. A rising gradient AB and a falling gradient BC are to be connected by a vertical curve. Based on the data given in Table Q1, design the curve at 20 metres intervals. First Grade (+ %) Second Grade (+ %) Sighting Distance (SSD) Driver's eye (h,) Object height (h₂) 3.7 -2.3 140 1.05 0.3 Table Q1 (Units are in metres) RL of highest/lowest pt Chainage of highest/lowest pt 38.501 3694.118
A B Data C D ANSWERS (Q1) Note: A symbol denotes an invalid number or numbers in the corresponding row First Grade (+ %) Second Grade (± %) Sighting Distance (SSD) Driver's eye (h₂) Object height (h₂) Chainage highest/lowest pt RL highest/lowest point Chainage A Chainage B Chainage C E Solution All distnces are in metres, unless otherwise specified. Length of Curve RLA RL B F RL c G H Dist. high/low pt Offset high/low pt (y)| RL Grade high/low pt dH high/low pt J K