Posting travel times on dms webinar 042711
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Posting travel times on dms webinar 042711

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The following Transportation agencies, Idaho Transportation Department (ITD), North Carolina Department of Transportation (NCDOT), Illinois Department of Transportation (IDOT) and Maryland State ...

The following Transportation agencies, Idaho Transportation Department (ITD), North Carolina Department of Transportation (NCDOT), Illinois Department of Transportation (IDOT) and Maryland State Highway Administration (M-SHA) will share lessons learned and best practices regarding Travel Time (TT) posting on Dynamic Message Signs (DMS) and the use of third party data services.

The webinar covered DMS Operations and:

• POLICIES…
• POSTINGS…
• UPDATES…
• WORK ZONES…
• VARIABLE SPEED LIMITS…
• PARTNERSHIPS: with Law Enforcement, TIM, etc…
• DATA RELIABILITY: data testing/history/accuracy…
• PUBLIC OUTREACH/MEDIA: customer feedback…
• MAINTAINING ASSETS: investment, financial aspects…
• EQUIPMENT: portable & fixed, characters, placement, detection…
.


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    Posting travel times on dms webinar 042711 Posting travel times on dms webinar 042711 Presentation Transcript

    • Posting Travel Times on Dynamic Message Signs & 3rd Party Data… best practices & lessons learned
      Welcome!
      Wednesday, April 27, 2011 11:00a.m. – 12:30 p.m. (Eastern Time) 
    • Posting Travel Times on Dynamic Message Signs & 3rd Party Data… best practices & lessons learned
      Disclaimer: Today’s webinar is being delivered at the request of several State Transportation agencies. FHWA does not endorse any of the 3rd Party Data Service providers/vendors discussed in the following presentations.
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • What prompted this webinar?
      • The Idaho Transportation Department’s interest in
      posting travel time
      • FHWA facilitated a teleconference for ITD with other
      state DOTs to learn of their approaches
      • Mutual assessment by the State Transportation
      agencies involved and FHWA that this topic was of
      national interest and so deserved a webinar to share
      lessons learned & best practices.
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • 2009 MUTCD Reference
      Changeable Message Signs
      Section 2L.02 Applications of Changeable Message Signs
      G. Travel Time
      We have three poll questions we would like you to respond to:
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Posting Travel Times on Dynamic Message Signs & 3rd Party Data… best practices & lessons learned
      Moderator & Speaker Bios are available in the “Download Bios & Today’s Presentation Pod”
      ModeratorBob KoeberleinMobility Services EngineerIdaho Transportation Department
      We have three speakers today:
      Special Guest Speakers
      ● Jennifer Portanova
      State ITS Operations EngineerNorth Carolina Department of Transportation ---● Jeff GalasTraffic Systems Center ManagerIllinois Department of Transportation---● Richard DyeCHART Systems Administrator Maryland State Highway Administration---
      Wednesday, April 27, 2011 11:00a.m. – 12:30 p.m. (Eastern Time) 
    • Posting Travel Times on Dynamic Message Signs & 3rd Party Data
      … best practices & lessons learned
      April 27, 2011
      Jennifer Portanova, PE
      North Carolina Department of Transportation
      State ITS Operations Engineer
    • POLICY
      • No formal policy
      • Guidelines
      • Time of day TT will be posted
      • How often TT will be updated
      • Priority level of message
      • Message Format
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • LOCATION
      • Posting TT in urban & rural areas statewide
      • Pre-determined locations
      • Reoccurring congestion
      • Decision Point between two routes
      • Needs tweaking
      • Regional input on locations
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • POSTING
      HIGH
      • Automated and Manual Posting
      • Weekdays Peak Hours
      • 6 am to 9 am
      • 4 pm to 7 pm
      • Or if speeds drop below speed limit (automated)
      • Updated every:
      • 10 minutes (manual)
      • 1 minute (automated)
      • Low Message Priority
      LOW
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • POSTING FORMAT
      • Short Segments (96 mph)
      • Range Vs. No Range
      VS
      Current format
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • EQUIPMENT
      Not using portable devices
      • Permanent signs (DMS)
      • Discussed stationary
      • Challenges with older devices
      • Number of characters
      • Communication
      • Automation Software
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • DATA SOURCE: Manual
      • Vehicle probe speed data
      • Webpage with TT
      • Capped at Speed Limit
      • Round up
      • Message updated by operator
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • DATA SOURCE: Automated
      • Microwave speed sensors
      • Current software limits data source
      • Working on software for any source
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • DATA RELIABILITY
      • 3rd Party Microwave Sensor
      • Sensitivity
      • Maintenance
      • 3rd Party Vehicle Probe Data
      • Missing segments
      • Mountains
      • Source of data
      • Continues to improve
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • WORK ZONES & VARIABLE SPEED LIMITS
      • Permanent devices
      • Have some TT in WZ
      • Not strategically posting for a WZ, yet…
      • Working on WZ application
      • Variable speed limits
      • Only in WZ
      • Not in effect during peak hours
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • MAINTAINING ASSETS
      • Devices and data already existed
      • Funded operator positions to post
      • Webpage to make Manual TT easier
      • Future Investments
      • Upgrade DMS for automated TT
      • Strategic Development
      • SMARTlink RFP
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • LESSONS LEARNED
      • Automated ideal – monitoring still required
      • Regional perspective important
      • Avoid ranges on small segments
      • Expect to make changes
      • Have a Champion
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Posting Travel Times on Dynamic Message Signs & 3rd Party Data
      … best practices & lessons learned
      Jeff Galas, Traffic Systems Center Manger
      Illinois Department of Transportation
    • Travel Times in the Chicago Area
      Illinois Department of Transportation
      District 1
      Traffic Systems Center
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Network of over 2400 detectors –
      168 centerline miles monitored
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Combination of Detection Methods:
      • Induction Loops
      • RTMS microwave detectors
      • Microloops (magnetometers)
      • Bluetooth capture
      Spaced approximately every 0.5 mile
      Interfaced to the ATMS as
      Volume and Occupancy (presence)
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • 42 Expressway Dynamic Message Signs
      14 Arterial DMS
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Combination of DMS Technologies
      • Flip Disk – Fiber optic enhanced
      25 to 30 year old
      • LED Full matrix Walk-in NTCIP compliant
      More recent installations
      • LED Full matrix / Full Color
      Replacing the oldest of the old
      MUTCD Graphics capability
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Near Real Time Congestion and Travel Times
      • Available to the public for over 30 years
      • Distributed through local television and radio outlets
      • Broadcast on Highway Advisory Radio
      • Displayed on the LMIGA website
      • Displayed on Dynamic Message Signs
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Congestion messages displayed on DMS …. Daytime only
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Challenged to start displaying Travel Times
      • Use existing Travel Time algorithms
      • Determine and develop new Travel Time zones
      • Interface to sign controller
      • Monitor operation for accuracy
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Travel Time Calculation:
      Each station is sending presence information in real time
      20 second sample is stored
      Speed is calculated using Volume and Occupancy:
      Speed = 3600 (Volume) (average vehicle length)
      52.8 (polling interval) (Occupancy)
      Average vehicle length varies by lane (17 feet to 22 feet)
      Data is normalized prior to calculation
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Travel Time Calculation:
      Speed is used to calculate relative time:
      Travel Time = Length of segment
      Speed
      Each segment is adjusted for actual spacing between detectors
      Segment times are concatenated for longer zones
      Zone travel times averaged over 5 minute period
      before being published or displayed
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • ATMS Vehicle Detection Station – Estimated Speed
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • ....DMS Travel Times
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Guidelines for DMS Messages
      Hierarchy of messages displayed:
      1,2 Priority message (Crash, pavement failure, incident)
      ATMS incident
      Scheduled message (lane closures, planned events)
      2 phase Congestion / Travel Times
      AMBER alert
      Travel Times
      8,9 Stored message (PSA ,seat belt, DUI, etc)
      10 Previous ATMS travel times
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Messages refer to landmarks and destinations
      DMS
      Travel Time zones
      do not exceed
      10 miles
      O’Hare Airport
      Junction
      Circle
      159th street
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Desire (demand) for travel times
      • Public has become accustomed to travel times
      • Media focus on travel time info
      • When outages occur, calls come in
      • Requests for system expansion
      • Difficulties in construction zones
      • When the loops are removed
      • RTMS units
      • Bluetooth
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Construction Alternatives
      “Bridge” Detection zones – short distances
      Probe Vehicles
      Travel times manually entered as received
      RTMS units
      conflict with construction staging
      re-calibration based on lane configuration
      Bluetooth
      Fairly accurate alternative
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • DMS Travel Times during Construction
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Investment in infrastructure
      Initial installation
      Approximately $250,000 per sign
      Truss, Sign, power, communication
      ATMS modification and software
      Maintenance
      Under contract - $26,000 per month for system
      Additional cost for battery back-up sign - $1,000 / year
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Using the I-95 Corridor Coalition Vehicle Probe data to put Automated Travel Times on Dynamic Message Signs in Maryland
      Richard R. Dye
      CHART Systems Administrator
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
      • As recently as December 2007, Travel Times on DMS was scheduled for FY 2012 due to lack of infrastructure to provide good data and the need to devote a major build entirely to this effort.
      • In the mean Time CHART was preparing the background logic in smaller builds (System Alerts R3B1, Scheduler and Event-based Notification R3B2)
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
      • That same month, the I-95 Corridor Coalition awarded a Travel Time contract and software development for automated messages on CHART signs was pushed forward to meet the challenge
      • Work was also begun on Engineering Guidelines for Implementing Travel Times On DMS in Maryland
      More Info, download Procedural Guidelines For Implementing Travel Time on DMS In CHART (PDF) at http://traffic.md.gov/readingroom/RR_ChartSWProgDocumenation.asp
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
      • …but… developing software to implement a 3rd party interface that had been neither developed nor tested was risky (to say the least)
      • This is the 1st time EVER that messages will be put on a CHART field device without the direct approval or even overt knowledge of an operator. How do we manage our risk?
      • … and the FHWA “map” was not going away
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Assumptions!
      • If the 3rd party data is good, we can move automated travel times on DMS up to a non-dedicated build if:
      • Routes in CHART will be built using links that we choose
      • This will allow us to avoid obvious trouble spots for probe-based systems (e.g. welcome station on I-95 where long runs parallel to the highway may confuse the data)
      • Travel Time will run during hours of day that we choose
      • This will allow us to avoid obvious trouble spots for probe-based systems (e.g. low volume of probes between 2am and 4am)
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Assumptions!
      • Travel times will be displayed in ranges, not exact times
      • The currently approved quality scores will be used to determine if a message is displayed
      • A smoothing algorithm will be added to the travel time data received from The 3rd party vendor
      • This should mitigate the severity of seriously outlying data points
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Assumptions!
      • If a maximum travel time threshold is received, the message will not be displayed and an alert will be set to the controlling Ops Center as well as notification to selected pager/email groups in the system
      • Travel times below a minimum will display travel time as if the speed limit were traveled
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Timeline
      • CHART Release 3, Build 3 was deployed in December 2009 and was composed of:
      • Traveler Information Messages, including Travel Times and Toll Rates obtained via an external connection to the two different 3rd party vendors system and Vector system.
      • Device Location fields to CHART devices, including DMS, TSS (Detectors), HAR, SHAZAM, and Cameras allowing the system to show devices close to traffic events to aid in event response.
      • External Event Import including External Event Alert
      • External DMS and TSS import from RITIS.
      • Capability to manage geographical area definitions
      • Direct TCP/IP communication for DMS and TSS
      More Info, download CHART R3B3 Detailed Design.pdf at http://traffic.md.gov/readingroom/RR_ChartSWProgDocumenation.asp
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • How Did It Turn Out?
      • Privileged operators can create travel routes
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • How Did It Turn Out?
      • For maximum flexibility, DMS Message Templates are used to define the format and layout of messages used to show travel times and/or toll rates on DMSs. Message templates target DMSs of a specific size (rows /columns) to allow layout features such as column data and to ensure messages created with the template match the layout specified by the template designer.
      • Templates may contain both text and data fields. Data fields will be replaced with actual data from one or more Travel Routes when a template is used for a DMS message.
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • How Did It Turn Out?
      • Any Operator can see
      • The name and length of the route
      • The current travel time for the route
      • The current travel time trend
      • The current average speed on the route
      • The current toll rate for the route
      • The devices using the travel route
      • The roadway route(s) that are included in the travel route.
      • The roadway direction(s) that are included in the travel route.
      • The Counties that are included in the travel route
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
      • Travel Time started on I-95 between the beltways in January 2010
      • Travel Times run 5am to 9pm weekdays
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
      • Travel Time expanded to both beltways in March 2010
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • August 2010 – Senior Management Weighs in
      - All signs displaying travel time need to also display the distance to the destination(s).
       
      - The distance as displayed on single destination signs to read XX MINUTES on line 3 if there is room. XX MIN otherwise.
       
      - For multiple destination signs, the sign should display XX MI between the destination and the travel time.
       
      - In a few cases, the destination description is too long for XX MI to fit on the same line.  In these cases the message should be revised to report travel time to a single destination. 
      • Travel Time expanded westward and to the eastern shore in Late 2010
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • What Can the Operators See?
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • What Makes up a Route?
      Links that we receive from the 3rd party vendor and build into a Route
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • And general settings (max displayable time, min travel time, who to alert when things go wrong – remember the assumptions?)
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • …and a Dynamic Message Sign!
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • What Does the Public See?
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • What if Travel Time is Exceeded?
      What Does the Operator See?
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • What if Data Quality is too Low?
      What Does the Operator See?
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • What if there is a Conflict?
      What Does the Operator See?
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • What Does the Public See?
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Experience So Far
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar
    • Any Questions for our Speakers?
      Thank You!
      Ray Murphy, ITS Specialist
      Office of Technical Services
      ray.murphy@dot.gov, 708-215-1301
      FHWA Operations
      http://ops.fhwa.dot.gov/
      FHWA Real-Time System Management Information Program
      SAFETEA-LU, Subtitle B, §1201
      Provisions of the Rule – 23 CFR Part 511
      Bob Rupert, FHWA, 202-366-2194, Robert.Rupert@dot.gov
      http://ops.fhwa.dot.gov/1201/
      Posting Travel Times on Dynamic Message Signs & 3rd Party Data Webinar