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Intersections <br />US Customary <br />Metric <br />Design <br />speed <br />(km/h) <br />Intersection sight <br />distance <br />Design <br />speed <br />(mph) <br />Intersection sight <br />distance <br />Stopping Passenger cars <br />Stopping Passenger cars <br />. <br />sight Calculated Design <br />distance (ft) , ft) (ft) <br />sight Calculated Design <br />distance (m) (m• cm) <br />20 <br />30 <br />40 <br />50 <br />60 <br />70 <br />80 <br />90 <br />100 <br />110 <br />120 <br />130 <br />_ <br />' 20 30.6 35 <br />36 45.9 50 <br />60 61.2 65 <br />65 76.5 80 <br />85 91.7 95 <br />105 107.0 110 <br />130 122.3 125 <br />• 160 137.6 140 <br />185 152.9 155 <br />220 168.2 • 170 <br />250 183.5 185 <br />285 198.8 200 <br />• <br />15 <br />20 <br />, 26 <br />30 <br />35 <br />40 • <br />45 <br />50 <br />55 <br />60 <br />65 <br />70 <br />75 <br />80 <br />80 121.3 125 <br />115 161.7 165 <br />155 202.1 205 <br />200 242.6 245 <br />250 283.0 285 <br />305 323.4 325 <br />360 363.8 365 <br />425 • 404.3 405 <br />495 444.7 445 <br />570 485.1 490 <br />645 525.5 530 <br />730 566.0 570 <br />820 • 606.4 610 <br />910 646.8 650 <br />Note: Intersection sight.distance shown is or a passenger car a <br />undivided highway. For other conditions and design vehicles, the time gap should be <br />adjusted and the sight distance recalculated. <br />Exhibit 9-67. Intersection Sight Distance Case F—Left Turn from Major Road <br />If stopping sight distance has been provided continuously along the major road and if sight <br />distance for Case B (stop control) or Case C (yield control) has been provided for each rainor- <br />road approach, sight distance will generally be adequate for left turns from the major road. <br />Therefore, no separate check of sight distance for Case F may be needed. <br />However, at three -leg intersections or driveways located on or near a horizontal curve or <br />crest vertical curve on the major road, the availability of dequate sight distance for left tams <br />from the major road should be checked. In addition, the availability of sight distance for left turns <br />from divided highways should be checked because of the possibility of sight obstructions in the <br />median. <br />At four -leg intersections on divided highways, opposing vehicles turning left can block a <br />driver's view of oncoming traffic. Exhibit 9-98, presented later in this chapter, illustrates <br />intersection designs that can be used to offset the opposing left -turn lanes and provide left -turning <br />drivers with a better view of oncoming traffic, <br />15 ' <br />675 <br />