Concept of Operations for Intersection Conflict Warning ... - Enterprise

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5.4 Major and Minor Road Alert for 2-Lane/2-Lane (or Multi-Lane)IntersectionTwo alerts are delivered simultaneously in this ICWS configuration. As the major road driver (V1)approaches the intersection they will see a corresponding ICWS. If the ICWS detects a vehicle on theminor road (V2), the major road driver will see or will have seen a dynamic warning to alert them that avehicle is approaching the intersection or waiting at the STOP (or median YIELD) on the minor road.Simultaneously, as the minor road driver approaches the intersection they will see the STOP andcorresponding ICWS. If the ICWS detects a vehicle on the major road, the system will display a dynamicwarning to alert the minor road driver that a vehicle is approaching the intersection on the major road.Both the major and minor road alerts may also indicate the direction of travel for the approachingvehicle. The alerts will remain active as long as vehicles are detected on the opposing roads. The majorroad driver will watch the ICWS, in conjunction with traffic and other traffic control devices, todetermine if evasive action may be needed. At the same time, the minor road driver will watch theICWS, in conjunction with approaching vehicles and other traffic control devices, to determine when itmay be safe to navigate the intersection. As illustrated in Figure 5, for a 2-lane major road, one sign maybe placed on the right side (1a). For a multi-lane major road, an additional sign may be placed on the leftside (1b). Warning signs for the minor road may be placed left from STOP (2), on the far-side oppositecorner (3) from STOP, OR on the far-side corner (4) from STOP. Signing has also been suspended abovethe in the intersection but has since been found ineffective through a safety effectiveness evaluationconducted by the North Carolina Department of Transportation.Figure 5 Major and Minor Road Alert for 2-Lane/2-Lane (or Multi-Lane) IntersectionMinorRoadN(1b)(3)(4)V1(1a) (2)Detection is typically placed500-1,000’ beforeintersection in conjunctionwith static intersectionwarning signs and based onMUTCD Table 2C-4.Guidelines for AdvancePlacement of Warning SignsV2MajorRoadDetection placementand type aredependent on whetherthe system is time ordistance based.Detection is typically placedat or 500’ beforeintersection in conjunctionwith static STOP AHEADwarning signs and based onMUTCD Table 2C-4.Guidelines for AdvancePlacement of Warning SignsConcept of Operations for Intersection Conflict Warning Systems Page 15
ReferencesAASHTO. (2005). AASHTO Strategic Highway Safety Plan. Washington DC: American Association of StateHighway and Transportation Officials. Retrieved fromhttp://safety.transportation.org/doc/Safety-StrategicHighwaySafetyPlan.pdfFHWA. (2009). Manual on Uniform Traffic Control Devices. Washington DC: Federal HighwayAdministration.NHTSA. (2010). Crash Factors in Intersection-Related Crashes: An On-Scene Perspective. National Centerfor Statistics and Analysis. Washington DC: National Highway Traffic Safety Administration.Retrieved from http://www-nrd.nhtsa.dot.gov/Pubs/811366.pdfNHTSA. (2011). Traffic Safety Facts 2009. Washington DC: National Highway Traffic SafetyAdministration. Retrieved from http://www-nrd.nhtsa.dot.gov/Pubs/811402.pdfUSDOT. (2009). Highway Statistics 2009; Table HM-10 Public Road Length 2009 Miles by Ownership.Retrieved August 10, 2012, from Federal Highway Administration:http://www.fhwa.dot.gov/policyinformation/statistics/2009/hm10.cfmConcept of Operations for Intersection Conflict Warning Systems Page 16
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Page 4 and 5: 1. IntroductionThere are over four
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Page 8 and 9: Challenge ID NeedDriver views of th
Page 10 and 11: 3.1.16 Drivers will understand when
Page 12 and 13: 3.4.6 When driving by an ICWS, law
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