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

More documents

Recommendations

Info

conducted. It is also expected to serve as preliminary guidance for what may eventually be included inthe Manual on Uniform Traffic Control Devices (MUCTD) and the Highway Safety Manual.1.2 StakeholdersThe deployment and operation of ICWS will be driven by the needs of the stakeholder groups who willinteract with them. Such needs have been identified for two primary groups – drivers and transportationagencies.Drivers of the major and minor roads at stop-controlled intersections equipped with ICWS; andTransportation agencies at the state, county and local level that will operate, maintain and ownthe ICWS.Industry who may design, manufacture and install ICWS for transportation agencies.Law enforcement who may observe operation of and driver compliance with ICWS.As national groups like the National Committee on Uniform Traffic Control Devices consider the need forand content of ICWS standards, a concept of operations will clearly articulate the fundamental needsand concept of the systems. This concept of operations is intended to articulate the basic needs andoperational concept surrounding ICWS. It does not mandate the deployment of such systems, nor doesit limit the engineering or policy discretion of the transportation agencies who may consider deployingICWS. This document reflects stakeholder needs based on known practice nationally and should beadapted as necessary to reflect any unique or additional needs driven by individual deployments. Theremainder of this concept of operations documents the needs of the noted stakeholder groups,describes an operational concept from the stakeholder perspectives, outlines systems componentsand presents common operational scenarios for ICWS that provide both major and minor road alerts.2. NeedsThis section presents system needs according to stakeholder groups. These needs will drive what thesystem must do and they will further define the system requirements for how ICWS must perform. Table1 lists stakeholder needs that are identified by first describing a challenge facing one or more of thestakeholders (column 1). Then, based on each challenge, one or more needs (column 3) are described.Each need is also numbered (column 2) for identification and traceability purposes. The needs arereferenced later in this document within in the operational concept and the list of proposed systemcomponents. The need identification allows each subsequent reference to be traced back to an originalneed and corresponding challenge.Table 1 Stakeholder Needs for ICWSChallenge ID NeedMajor road drivers approaching anintersection may not see or be aware ofvehicles at stop signs or yield signs on theminor road.1Major road drivers approaching an intersectionequipped with ICWS need an alert to indicate whenvehicles are approaching, at stop signs, or at yieldsigns on the minor road.Concept of Operations for Intersection Conflict Warning Systems Page 3
Challenge ID NeedMajor road drivers approaching anintersection are typically traveling athigher speeds; limiting the physical spacewithin which corrective action may betaken.Minor road drivers approaching, waiting atstop signs, or waiting at yield signs maynot see vehicles on the major road.Minor road drivers waiting at stop signs orat yield signs may have difficulty judgingwhen to enter the intersection.Continuous alerts can diminish thecredibility and value of a dynamic warningfor drivers.Drivers could become confused by ormisunderstand the message or intent of analert.Drivers travel among the states and couldbecome confused by or misunderstand theintent of an alert or signage.Drivers may not immediately notice theenhanced warning offered by ICWS as theyapproach or navigate through anintersection.Driver compliance with regulatory signingmust take precedence over advisorysigning.Drivers may become dependent uponsigns to help them understand when it isinadvisable to enter the intersections.Drivers could be confused by alerts if theirinactive (e.g. vehicle not detected) state isthe same as their malfunctioning state.234567891011Major road drivers need ICWS alerts to be visibleat a distance sufficient to allow drivers to takecorrective action as needed.Minor road drivers approaching, waiting at stopsigns, or waiting at yield signs of an intersectionequipped with ICWS need an alert to indicate whenvehicles are approaching the intersection on themajor road.Minor road drivers need ICWS alerts to be visiblewhile they are waiting at the stop sign or at theyield sign to support their decision to enter or crossthe major road.Drivers, transportation agencies and lawenforcement need alerts to be dynamic and notbecome nearly continuous so as to lose impact.Drivers, transportation agencies and lawenforcement need ICWS alerts to be easilyunderstood.Drivers, transportation agencies, law enforcementand industry need ICWS alerts and signage to beuniform throughout the United States, to theextent possible.Drivers who are distracted need ICWS alerts to beof a nature that will capture their attention.Transportation agencies and law enforcementneed ICWS alerts to provide supplemental warningthat does not contradict or override the regulatorysigns at the intersection.Drivers, transportation agencies and lawenforcement need ICWS to be operationalwhenever vehicles approach the intersection.Drivers, transportation agencies, law enforcementand industry need an ICWS malfunction to bereadily and easily differentiated from an ICWS thatis inactive due to lack of conflicting traffic.Concept of Operations for Intersection Conflict Warning Systems Page 4
Page 2 and 3: AcknowledgementsThis document was p
Page 4 and 5: 1. IntroductionThere are over four
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
Page 14 and 15: PowerComponentSupportRequiredIf sys
Page 16 and 17: 5.2 Minor Road Alert for 2-Lane/Mul
Page 18 and 19: 5.4 Major and Minor Road Alert for

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

Create successful ePaper yourself

Delete template?

Save as template?