A major roadway with a speed limit of 45 mi/h has an intersection that has no intersection control with a minor roadway at a right angle. A building is located next to the intersection at a distance of 60 ft from the center of the near lane on the major roadway and 40 ft from the center of the near lane on the minor roadway. At what speed for the minor roadway is the intersection safe? Grades are approximately level.
What will be an ideal response?
First, determine the distance on the minor road at which the driver first
sees traffic on the intersecting road. It is known that:
a. Speed limit of major road = 45 mi/h
b. da = 220 ft (from Table 7.7)
c. a = 60 ft
d. b = 40 ft
From Equation 7.4:
db / 220 = 60 / (220 – 40)
db = 73.33 ft
Table 7.7 shows that the maximum allowable speed on the minor road for
db = 73.33 ft is 15 mi/h. No correction is required for the approach grade as it is
approximately level.
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