Highway Engineering
The most efficient traffic signal system is

simple progressive system
alternate system
simultaneous system
flexible progressive system

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Highway Engineering
Length of a vehicle affects

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

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

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

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