Highway Engineering
Bitumen of grade 80/100 means

its penetration value is 8 to 10 cm
its penetration value is 8 to 10 mm
its penetration value is 8 mm
its penetration value is 10 mm

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Highway Engineering
Length of a vehicle affects

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

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