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37. The Association of American State Highway and Transportation Officials (AASHTO) assumes that the height of a driver’s eye and the height of an object above pavement are which of the following (in inches) when developing recommendations for minimum stopping sight distances?
39. What is the total volume of a grit chamber designed to handle an average daily flow of 3 million gallons with a peak flow ratio of 2.5, and a detention time of 3 minutes?