Highway Engineering
The diagram which shows all important physical conditions of an accident location like roadway limits, bridges, trees and all details of roadway conditions is known as

collision diagram
pie chart
condition diagram
spot maps

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Highway Engineering
A traffic rotary is justified where

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

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