A four-leg intersection with no traffic control is formed by two 2-lane roads with the speed limits on the minor and major roads being 25 and 40 mi/hr, respectively. If the roads cross at 90° and a building is to be located at a distance of 50 ft from the centerline of the nearest lane on the minor road, determine the minimum distance at which the building should be located from the centerline of the outside lane of the major road so that adequate sight distances are provided. Grades are approximately level.
What will be an ideal response?
To ensure sufficient sight distances for each intersection approach, a line
of sight must be provided that allows for sufficient time for a driver to perceive
and react to a vehicle on the crossing approach. The required distance (offset of
building from roadway) can be found using Table 7.7 and Equation 7.4.
Given:
b = 50 ft
From Table 7.7:
da = 195 ft (major approach)
db = 115 ft (minor approach)
115 / 195 = a / (195 – 50)
a = 85.51 ft
The distance between the centerline of the outside lane on the major road
and the building should be 86 ft.
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