Highway Engineering
Length of a vehicle affects

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

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Highway Engineering
The effect of grade on safe overtaking sight distance is

to decrease it on descending grades and to increase it on ascending grades
to increase it on descending grades and to decrease it on ascending grades
to increase it on both descending and ascending grades
to decrease it on both descending and ascending grades

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