Highway Engineering
For the construction of water bound macadam roads, the correct sequence of operations after spreading coarse aggregates is

dry rolling, wet rolling, application of screening and application of filler
dry rolling, application of screening, application of filler and wet rolling
dry rolling, application of screening, wet rolling and application of filler
dry rolling, application of filler, wet rolling and application of screening

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Highway Engineering
A traffic rotary is justified where

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

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