Highway Engineering
The aggregates required for one kilometer length of water bound macadam road per meter width and for 10 mm thickness is

15 cubic meter
10 cubic meter
8 cubic meter
12 cubic meter

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Highway Engineering
A traffic rotary is justified where

when traffic volume is more than 5000 vehicles per hour
number of intersecting roads is between 4 and 7
when traffic volume is less than 500 vehicles per hour
space is limited and costly

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