CHAPTER 2 BARRIER WARRANTS

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Barrier Warrants ________ November 2005Table 2.5: Grading FeaturesPotential Hazard Group 1(LowSeverity)Group 2(ModerateSeverity)Group 3(HighSeverity)Parallel Ditches:Ditches outside the preferred cross section onFigures 3.6 and 3.7 of the RDG and with foreslopeflatter than 1V: 3HDitches with foreslopes 1V: 3H or steeper (Deepditches should also meet the foreslope criteriabelow)XXSlopes1V: 3H foreslope less than 2 m (7 ft) high* X1V: 3H foreslope 2 m (7 ft) and higher* X1V: 2H to 1V: 1.5H foreslope less than 4 m (13 ft)Xhigh*1V: 2H to 1V: 1.5H foreslope 4 m (13 ft) high andhigherVertical foreslope or fill wall less than 2 m (7 ft) highXVertical foreslope or fill wall 2 m (7 ft) and higherBackslopes that are uneven, or with deep erosionXruts, large rocks, and treesVertical backslope with horizontal projections of 200 Xmm (4 in) or smallerVertical backslope with horizontal projections largerXthan 200 mm (4 in)Downward intersecting slope (transverse to travelway, such as a river bank) 1V: 4H or steeper,Xbetween than 0.5 (2 ft) high to 2 m (6 ft) highDownward intersecting slope (transverse to travelway, such as a river bank) 1V: 4H or steeper, 2 m(6 ft) or higherUpward intersecting slope (transverse to travel way,such as an overpass fill) 1V: 4H to flatter than 1V:X1.5H, greater than 0.3 m (1 ft) highUpward intersecting slope (transverse to travel way,such as an overpass fill) 1V: 1.5 H or steeper,greater than 0.3 m (1 ft) highXXXX* Slopes are assumed to be relatively smooth and free of obstacles. If slopes are uneven, havedeep erosion ruts, large rocks and trees or other vegetation that may cause a vehicle to beunstable, then the classification should be increased one category. Conditions at the bottom ofthese slopes must also be evaluated.________________________________________________________________________2-10 Identify Potential Hazards
Barrier Warrants ________ November 2005Table 2.6: Other FeaturesPotential Hazard Group 1(LowSeverity)Group 2(ModerateSeverity)Group 3(High Severity)Parallel smooth retaining wall or cut slopeRetaining wall parallel or flared away fromapproaching traffic at flatter than 1:8Retaining wall flared away from approachingtraffic at 1:8 or steeperWater at a depth of 0.3 m (1 ft) to 1 m (3 ft)Water at a depth of 1 m (3 ft) or deeperXXXXXFigure 2.4: Vertical Drop and Boulders________________________________________________________________________Identify Potential Hazards 2-11
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CHAPTER 2 BARRIER WARRANTS

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