St. Johns County Travel Time System

Project Description: This project would add bluetooth devices to detect travel times on county roads in St. Johns County, and output travel times to the traveling public via a traveler information system and DMS.

Project Status: Planned

Project Stakeholders:

• St. Johns County Traffic and Transportation Department
• St. Johns County/City of St. Augustine
• Travelers

Project Service Packages:

• TM06: Traffic Information Dissemination (St. Johns County Traffic Signal System)
• TM01: Infrastructure-Based Traffic Surveillance (St. Johns County Travel Time System)

Project Information Flows:

Information Flow	Source Element	Destination Element	Status
communications signature	Vehicles	St. Johns County Field Equipment	Planned
passive vehicle monitoring control	St. Johns County TMC	St. Johns County Field Equipment	Planned
passive vehicle monitoring data	St. Johns County Field Equipment	St. Johns County TMC	Planned
road network conditions	St. Johns County TMC	St. Johns County/City of St. Augustine Traveler Information System	Planned
roadway dynamic signage data	St. Johns County TMC	St. Johns County Field Equipment	Planned
roadway dynamic signage status	St. Johns County Field Equipment	St. Johns County TMC	Planned

Project Functional Requirements (Element - Functional Object):

• St. Johns County Field Equipment - Roadway Basic Surveillance
• 1: The field element shall collect, process, digitize, and send traffic sensor data (speed, volume, and occupancy) to the center for further analysis and storage, under center control.


• St. Johns County Field Equipment - Roadway Passive Monitoring
• 1: The field element shall collect, process, and send data to the center to uniquely identify passing vehicles in order to support travel time measurement


• St. Johns County Field Equipment - Roadway Traffic Information Dissemination
• 1: The field element shall include dynamic message signs for dissemination of traffic and other information to drivers, under center control; the DMS may be either those that display variable text messages, or those that have fixed format display(s) (e.g. vehicle restrictions, or lane open/close).
• 3: The field element shall provide operational status for the driver information systems equipment (DMS, HAR, etc.) to the center.
• 4: The field element shall provide fault data for the driver information systems equipment (DMS, HAR, etc.) to the center for repair.


• St. Johns County TMC - TMC Passive Surveillance
• 1: The center shall collect time stamped vehicle identities from field equipment.
• 2: The center shall correlate the time stamped vehicle identities in order to calculate link travel times and derive other traffic measures.


• St. Johns County TMC - TMC Situation Data Management
• 1: The center shall collect traffic probe data from vehicles via roadside field equipment.


• St. Johns County TMC - TMC Traffic Information Dissemination
• 1: The center shall remotely control dynamic messages signs for dissemination of traffic and other information to drivers.
• 3: The center shall collect operational status for the driver information systems equipment (DMS, HAR, etc.).
• 4: The center shall collect fault data for the driver information systems equipment (DMS, HAR, etc.) for repair.


• St. Johns County/City of St. Augustine Traveler Information System - TIC Traveler Information Broadcast
• 1: The center shall disseminate traffic and highway condition information to travelers, including incident information, detours and road closures, event information, recommended routes, and current speeds on specific routes.
• 10: The center shall provide the capability for a system operator to control the type and update frequency of broadcast traveler information.


• Vehicles - Vehicle Location Determination
• 1: The vehicle shall provide the vehicle's current location to other in-vehicle functions.

Standards:

• (Data Not Needed) - Bluetooth
• (None-Data) - Secure Internet (ITS)
• US: NTCIP Message Sign - SNMPv3/TLS
• US: TMDD - NTCIP Messaging

Project Operational Concepts:

Roles and Responsibilities

• St. Johns County Traffic and Transportation Department
• Obtain travel times via roadside field equipment.
• Provide traffic information to travelers using the county public information system, private companies, FL511, and the media.