Highway Engineering
In case of summit curves, the deviation angle will be maximum when

an ascending gradient meets with a level surface
a descending gradient meets with another descending gradient
an ascending gradient meets with another ascending gradient
an ascending gradient meets with a descending gradient

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Highway Engineering
Length of a vehicle affects

width of traffic lanes
clearance to be provided under structures such as overbridges, under-bridges etc.
width of shoulders and parking facilities
extra width of pavement and minimum turning radius

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