Highway Engineering
Scientific planning of transportation system and mass transit facilities in cities should be based on

accident data
origin and destination data
spot speed data
traffic volume data

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

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