IntelliDrive Research – Signal Phase _ Timing + Related Messages

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					       IntelliDrive Research
Signal Phase & Timing (SPaT)
   and Related Messages
              Edward Fok
      Office of Technical Service
             San Francisco
                             Research Goal
• Define an open interface for two-way
  communication of traffic signal information
  between traffic signal controller and a mobile
  device
                             Purpose of SPaT
• Traffic signal control information that conveys
  the current movement state of each active
  phase in the system will provide the capability
  for:
  – Safety applications such as warnings and alerts for
    crash avoidance
  – Mobility applications to enable dynamic and
    efficient traffic management
  – Environment applications that allow savings in
    fuel consumption and reduction in CO2 emissions.
                        Related Messages
• Map data that conveys the gemetric layout of
  the associated intersection
• Positioning data that allows the correlation of
  the signal and map data
                                                                                            SPaT Operation Overview




                                                                                                                    DSRC radio

                                                                                                                  SPaT Processor
                                                                   Intersection ID: 23983


                                     1   2




         No Dedicated turn signals   X                      Left turn and



                                                                                                                           Map storage/
                                                            through signals




                   10
                                                           X                  3

                                                                              4

                                                                              5
                                                                                                            Positioning/
                                             X
                   9

                   8
                                 X
                                                                                                                GPS            GID
               Left turn and
               through signals
                                                     X   No Dedicated turn signals



                                                 7   6
                                                                    Lane Centerline



                                                                                                                     Traffic
                                                               5    Lane ID
                                                               X Intersection Location
                                                               X Stopping Location




GPSC                    MAP/GID SPaT                                                                              Control Device
   On Board Equipment (OBE)
             Open Interface – Concept
Traffic               Interface to be defined
Signal
Controller
 NEMA TS-X
    2070      NTCIP                                   Mobile
              1202                                  Equipment
     ATC
   Others                                    SAE
                                            J2735
              Desirable Characteristics
• Minimize the need for new standard objects,
  or ideally: no new objects.
• Traffic Controller standard may reference SAE
  J2735
• SAEJ2735 reference NTCIP 1202
• Updates expected for both Standards
               Process for Development
• Review of relevant Past and Current research
• Creation of user forums
  – Traffic Control Industries
  – Modal Partners
  – Vehicle and Tier-1 OEM
• Concept of Operation Development
• Prototype Development
• Finalize Interface
                     Signal Phase and Timing
                     Research Roadmap (planned)
                   CY 2010                                           CY 2011                                                       CY 2012
             1Q   2Q     3Q                4Q        1Q             2Q     3Q                         4Q           1Q             2Q     3Q                        4Q
                   Issue    Contract
Track 1            SOW      Award
  Project                  PMP &
  Mgmnt                    SEMP

                              Rsrch/ Lit    Subject Matter Expert Workshop
Track 2                         Rev
                                            Cap    Con
                                            Anal   Ops          ConOps
 Concept
                                                                Walkthrough
Definition

                                                                                               Update
                                                         Reqs
Track 3                                                                                      Requirements
                                                                 Requirements
 Rqrmnts                                                         Walkthrough


                                                                   Develop (2)                  Integrate SPaT
                                                                   Prototypes                      with Map,
                                                                                 Draft           Positioning, &                            Finalize Interface Definition
                                                           Build Environment for Interface          Security
                                                           prototype evaluation Definition
Track 4
Prototype                                                                Review Draft with Standards
                                                                               Stakeholders
                                                                                                      Develop Prototypes with additional vendors

Track 5                                                                                Test initial
                                                                                                         Additional Prototype Testing              Safety Pilot Model
                                                                                       Prototypes                                                    Deployment
Testing

				
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posted:4/23/2013
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