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Pre-condition of road design
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Table-1 ;
Relation between Radius and Super Elevation by different driving speed
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* Maximum super elevation fixed 6% due to privent falling down of over loading
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heavy trucks.
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120km/h100km/h80km/h60km/hSuper Elevation
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Min.Max.Min.Max.Min.Max.Min.Max.
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Radius (m)(%)
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 570 610 380 430 230 280 120 150 6
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 610 670 430 480 280 330 150 190 6
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 670 760 480 550 330 380 190 230 6
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 760 880 550 640 380 450 230 270 6
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 880 1,030 640 760 450 540 270 330 6
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 1,030 1,280 760 930 540 670 330 420 5
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 1,280 1,660 930 1,210 670 870 420 560 4
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 1,660 2,300 1,210 1,700 870 1,240 560 800 3
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 2,300 7,500 1,700 5,000 1,240 3,500 800 2,000 2
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 7,500 5,000 3,500 2,000
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Figure-1 ;
Relation for Super Elevation Between Straight and Curve of alignment
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* Road camber shall be -1.5% at R=∞ (straight) for drainage of road surface.
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BCR
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R = ∞
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6.0%
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0%1.5%
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-1.5%6.0%
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TRSR
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Figure-2 ;
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Taper rate=75m/(1.5%+6%)=10m/%
6.0%
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0%
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-1.5%
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75m
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The taper is 75m section from -1.5% to 6%.
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Taper rate=10m/% .
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For Calculation example
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Conditions:
Radius=400m
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Curve length=139.626m
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Super elevation (R=400)=6% (See Table-1)
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TR=(1.5%-0%)×Taper rate=1.5%×10m/%=15m
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SR=(6%-0%)×Taper rate=6%*10m/%=60m
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When BC is assumed 100, EC becomed 239.626 automatically.
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(BC+Curve length=100+139.626=239.626)
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The above conditions (TR=15m,SR=60m,Radius=400m,BC=100,EC=239.626 and Super elevation=6%)
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inputted in Super elvation sheet.
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