Highway Engineering
The most economical lighting layout which is suitable for narrow roads is

Staggered system
Single side lighting
Central lighting system
None of these

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

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

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