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• 11 <br />Metric <br />Design <br />speed <br />(km/h) <br />20 <br />30 <br />50 <br />60 <br />70 <br />80 <br />90 <br />100 <br />110 <br />120 <br />130 <br />Stopping <br />sight <br />distance (m) <br />Intersections <br />US'Customary <br />Intersection sight <br />distance <br />Design Stopping - Passenger cars <br />speed sight Calculated Design <br />(mph) distance (ft) • .(ft) (ft) <br />20 15 SO 121.3 <br />35 20 115 161.7 <br />50 . 25 155 202.1 <br />66 30 200 242.6 <br />85 35 250 283.0 <br />105 40 ' 305 323.4 <br />130 45 360 363.8 <br />160 50 425 ' 404.3 <br />185 55 495 444.7 <br />220 60. 570 485.1 <br />250 65 645 525.5 <br />285 70 730 566.0 570 <br />75 820 • 606.4 610 <br />80 910 646,8 650 <br />Intersection sight <br />distance <br />Passenger cars <br />Calculated Design <br />(m) <br />35 <br />50 <br />65 <br />80 <br />95 <br />110 <br />125 <br />140 <br />155 <br />170 <br />185 <br />200. <br />(m) <br />30.6 <br />45.9 <br />61 .2 <br />76.5 <br />91.7 <br />107,0 <br />122,3 <br />137.6 <br />162,9 <br />168.2 <br />183,5 <br />198.8 <br />125 <br />165 <br />205 <br />245 <br />285 <br />325 <br />365 <br />405 <br />445 <br />490 <br />530 <br />Note: Intersection sight distance shown is for a passenger car making a left turn from an <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 minor - <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 adequate sight distance for left turns <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 chnpter, illustrates <br />intersection designs that can be used to offset the opposing left -turn lanes a-nd provide left -turning <br />drivers with a better view of oncoming traffic, <br />P. <br />iJj <br />I c <br />• <br />I ! <br />t <br />:1 <br />t• <br />3 <br />675 <br />J • <br />1: <br />