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U , w <br />Intersections <br />Design <br />speed <br />(km/h) <br />Metric <br />Intersection sight <br />distance <br />Stopping Passenger cars <br />sight Calculated Design <br />distance (m) rn m <br />Design <br />speed <br />(mph) <br />US Customa <br />Intersection sight <br />distance <br />Stopping Passenger cars <br />sight Calculated Design <br />distance (ft) ft ft <br />20 <br />20 <br />30.6 <br />35 <br />15 <br />80 <br />121.3 <br />125 <br />30 <br />35 <br />45.9 <br />50 <br />20 <br />115 <br />161.7 <br />165 <br />40 <br />50 <br />61.2 <br />65 <br />.25 <br />155 <br />202.1 <br />205 <br />50 <br />65 <br />76.5 <br />80 <br />30 <br />200 <br />242.6 <br />245 <br />60 <br />85 <br />91.7 <br />95 <br />35 <br />250 <br />283.0 <br />285 <br />70 <br />105 <br />107.0 <br />110 <br />40 <br />305 <br />323.4 <br />325 <br />80 <br />130 <br />122.3 <br />125 <br />45 <br />360 <br />363.8 <br />365 <br />90 <br />160 <br />137.6 <br />140 <br />50 <br />425 <br />404.3 <br />405 <br />100 <br />185 <br />152.9 <br />155 <br />55 <br />4.95 <br />444.7 <br />445 <br />110 <br />220 <br />168.2 <br />170 <br />60 <br />570 <br />485.1 <br />490 <br />120 <br />250 <br />183.5 <br />185 <br />65 <br />645 <br />525.5 <br />530 <br />130 <br />285 <br />198.8 <br />200 <br />70 <br />730 <br />566.0 <br />570 <br />75 <br />820 <br />606.4 <br />610 <br />80 <br />910 <br />646.8 <br />650 <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 Tarn 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 sdequate 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. Ex1u'bit 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 -timing <br />drivers with a better view of oncoming traffic. ' <br />675 <br />136 <br />