1.6 Traffic Control (User Service*)
The Traffic Control user service provides for the integration and adaptive control of the freeway and surface street systems to improve the flow of traffic, give preference to transit and other high occupancy vehicles, and minimize congestion while maximizing the movement of people and goods. This service gathers data from the transportation system, fuses it into usable information, and uses it to determine the optimum assignment of right-of-way to vehicles and pedestrians. The real-time traffic information collected by the Traffic Control service is also disseminated for use by many other user services.
User Service Requirements*:
| 1.6.0 | ITS shall include a Traffic Control (TC) function. Traffic Control provides the capability to efficiently manage the movement of traffic on streets and highways. Four functions are provided, which are, (1) Traffic Flow Optimization, (2) Traffic Surveillance, (3) Control, and (4) Provide Information. This will also include control of network signal systems with eventual integration of freeway control. |
| PSpecs*: 1.1.1.1 , 1.1.1.6 , 1.1.1.7 , 1.1.2.1 , 1.1.2.10 , 1.1.2.11 , 1.1.2.2 , 1.1.2.3 , 1.1.2.4 , 1.1.2.5 , 1.1.2.6 , 1.1.2.9 , 1.1.3 , 1.1.4.1 , 1.1.4.2 , 1.1.4.3 , 1.1.4.4 , 1.1.5 , 1.1.6 , 1.1.7 , 1.2.1 , 1.2.2.1 , 1.2.2.2 , 1.2.3 , 1.2.4.1 , 1.2.4.2 , 1.2.4.3 , 1.2.4.4 , 1.2.4.5 , 1.2.4.7 , 1.2.6.1 , 1.2.6.2 , 1.2.7.1 , 1.2.7.10 , 1.2.7.12 , 1.2.7.13 , 1.2.7.5 , 1.2.7.7 , 1.2.7.8 , 1.2.7.9 , 3.1.3 , 3.5 , 5.3.2 , 5.3.7 , 5.4.1 , 5.4.8 , 6.1.1 , 6.1.3 , 6.2.2 , 6.2.4 , 6.5.1 , 6.5.2 , 6.5.8 | |
| 1.6.1 | TC shall include a Traffic Flow Optimization function to provide the capability to optimize traffic flow. |
| PSpecs*: 1.1.2.10 , 1.1.2.11 , 1.1.2.9 , 1.1.4.2 , 1.1.4.3 , 1.2.2.1 , 1.2.2.2 , 1.2.3 , 1.2.4.1 , 1.2.4.2 , 1.2.4.3 , 1.2.4.7 , 1.2.7.12 | |
| 1.6.1.1 | Traffic Flow Optimization shall employ control strategies that seek to maximize traffic-movement efficiency. |
| PSpecs*: 1.1.2.10 , 1.1.2.11 , 1.1.2.9 , 1.2.2.1 , 1.2.2.2 , 1.2.3 , 1.2.4.7 , 1.2.7.12 | |
| 1.6.1.1.1 | Traffic-movement control shall manage movement of traffic on streets. |
| PSpecs*: 1.1.2.10 , 1.1.2.11 , 1.1.2.9 , 1.2.2.1 , 1.2.2.2 , 1.2.4.7 , 1.2.7.12 | |
| 1.6.1.1.2 | Traffic-movement control shall manage movement of traffic on highways. |
| PSpecs*: 1.2.2.1 , 1.2.2.2 , 1.2.3 | |
| 1.6.1.1.3 | Traffic-movement control shall include the goal of minimizing delay times. |
| PSpecs*: 1.2.2.1 , 1.2.2.2 | |
| 1.6.1.1.4 | Traffic-movement control shall include the goal of minimizing energy use. |
| PSpecs*: 1.2.2.1 , 1.2.2.2 | |
| 1.6.1.1.5 | Traffic-movement control shall include the goal of minimizing air quality impacts due to traffic. |
| PSpecs*: 1.2.2.1 , 1.2.2.2 | |
| 1.6.1.2 | Traffic Flow Optimization shall include a wide area optimization capability, to include several jurisdictions. |
| PSpecs*: 1.1.2.10 , 1.1.2.11 , 1.1.2.9 , 1.2.2.1 , 1.2.2.2 , 1.2.3 , 1.2.4.1 , 1.2.4.2 , 1.2.4.3 , 1.2.4.7 , 1.2.7.12 | |
| 1.6.1.2.1 | Wide area optimization shall integrate the control of network signal systems with the control of freeways. |
| PSpecs*: 1.1.2.10 , 1.1.2.11 , 1.1.2.9 , 1.2.2.1 , 1.2.2.2 , 1.2.3 , 1.2.4.1 , 1.2.4.2 , 1.2.4.3 , 1.2.4.7 , 1.2.7.12 | |
| 1.6.1.2.2 | Wide area optimization shall include features that provide preferential treatment for transit vehicles. |
| PSpecs*: 1.2.2.1 , 1.2.2.2 | |
| 1.6.1.2.3 | Wide area optimization shall include features that provide preferential treatment for HOV. |
| PSpecs*: 1.2.2.1 , 1.2.2.2 , 1.2.3 | |
| 1.6.1.3 | Traffic Flow Optimization shall be implemented in a manner that seeks to optimize traffic movement over a large geographic area. |
| PSpecs*: 1.2.2.1 , 1.2.2.2 | |
| 1.6.1.4 | Traffic Flow Optimization shall include a Control function that is responsive to both the current demand as well as the expected demand. |
| PSpecs*: 1.1.2.10 , 1.1.2.11 , 1.1.2.9 , 1.2.2.1 , 1.2.2.2 , 1.2.4.1 , 1.2.4.2 , 1.2.4.3 , 1.2.4.7 , 1.2.7.12 | |
| 1.6.1.4.1 | The Control function shall include the capability to facilitate the dissipation of traffic congestion. |
| PSpecs*: 1.1.2.10 , 1.1.2.11 , 1.1.2.9 , 1.2.2.1 , 1.2.2.2 , 1.2.4.7 , 1.2.7.12 | |
| 1.6.1.5 | Traffic Flow Optimization shall provide the capability to predict travel patterns. |
| PSpecs*: 1.2.2.1 , 1.2.2.2 | |
| 1.6.1.6 | The Control function shall include the use of data acquired from traffic surveillance as feedback to the control strategies. |
| PSpecs*: 1.2.2.1 , 1.2.2.2 | |
| 1.6.1.7 | Implementation of the Control function shall include strategies that account for at least the following: |
| PSpecs*: 1.1.4.2 , 1.1.4.3 , 1.2.2.1 , 1.2.2.2 | |
| 1.6.1.7(a) | Human factors. |
| PSpecs*: 1.1.4.2 , 1.1.4.3 | |
| 1.6.1.7(b) | Driver/traveler behavior and expectancies. |
| PSpecs*: 1.2.2.1 , 1.2.2.2 | |
| 1.6.2 | TC shall include a Traffic Surveillance function. |
| PSpecs*: 1.1.1.1 , 1.1.1.6 , 1.1.1.7 , 1.1.2.1 , 1.1.2.10 , 1.1.2.11 , 1.1.2.2 , 1.1.2.3 , 1.1.2.5 , 1.1.2.6 , 1.1.2.9 , 1.1.3 , 1.1.5 , 1.1.6 , 1.1.7 , 1.2.4.1 , 1.2.4.2 , 1.2.4.3 , 1.2.4.7 , 1.2.7.12 , 1.2.7.7 , 1.3.4.6 , 5.4.1 , 5.4.8 , 6.5.8 | |
| 1.6.2.1 | Traffic Surveillance shall include a vehicle detection function with the capability of accurately detecting vehicles in a real-time fashion. |
| PSpecs*: 1.1.1.1 , 1.1.1.6 , 1.1.1.7 | |
| 1.6.2.1.1 | Vehicle detection shall include the capability to determine those vehicles that are HOVs. |
| PSpecs*: 1.1.1.1 | |
| 1.6.2.2 | Traffic Surveillance shall include a data collect function to provide the capability to collect data for determining traffic flow and prediction. |
| PSpecs*: 1.1.1.1 , 1.1.1.7 , 1.1.2.2 , 1.1.2.5 , 1.1.2.6 , 1.1.6 , 1.1.7 , 1.2.7.7 , 1.3.4.6 | |
| 1.6.2.2.1 | The data collect function shall provide the capability to quickly feedback traffic data to the control processes. |
| PSpecs*: 1.1.1.1 , 1.1.1.7 , 1.1.2.2 , 1.3.4.6 | |
| 1.6.2.3 | Traffic Surveillance shall include a wide-area surveillance capability to include several jurisdictions. |
| PSpecs*: 1.1.1.1 , 1.1.2.2 , 1.1.2.6 , 1.1.7 , 1.2.7.7 | |
| 1.6.2.3.1 | The wide-area surveillance shall gather speed and flow information. |
| PSpecs*: 1.1.1.1 , 1.1.2.6 , 1.1.7 , 1.2.7.7 | |
| 1.6.2.3.2 | The wide-area surveillance shall cover a large number of roadway segments. |
| PSpecs*: 1.1.2.2 , 1.1.2.6 , 1.1.7 , 1.2.7.7 | |
| 1.6.2.4 | TC shall provide the capability to acquire detailed traffic measurements at specific locations. |
| PSpecs*: 1.1.1.1 , 1.1.1.7 , 1.1.2.2 , 1.1.2.3 , 1.1.2.5 , 1.1.2.6 , 1.1.6 , 1.1.7 , 1.2.7.7 , 5.4.1 , 5.4.8 | |
| 1.6.2.4.1 | Traffic Surveillance shall include a data process function to process the traffic data which are acquired. |
| PSpecs*: 1.1.1.7 , 1.1.2.2 , 1.1.2.3 , 1.1.2.5 , 1.1.6 , 1.2.7.7 , 5.4.1 , 5.4.8 | |
| 1.6.2.5 | The wide area surveillance shall acquire sufficient data to provide the system with the knowledge of the existing conditions. |
| PSpecs*: 1.1.2.1 , 1.1.2.5 , 1.1.2.6 , 1.1.3 , 1.1.5 , 1.1.6 , 1.1.7 , 1.2.7.7 , 6.5.8 | |
| 1.6.2.5.1 | The data process function shall combine and process traffic data from multiple sources and times in order to improve the accuracy of the view of the current traffic condition. |
| PSpecs*: 1.1.2.1 , 1.1.2.5 , 1.1.6 , 6.5.8 | |
| 1.6.2.5.2 | The data process function shall process traffic data to generate near term predictions of traffic conditions. |
| PSpecs*: 1.1.3 , 1.1.5 | |
| 1.6.2.6 | The Traffic Surveillance function shall include detection of pedestrians and non motorized vehicles. |
| PSpecs*: 1.1.1.7 | |
| 1.6.3 | TC shall include a Device Control function. |
| PSpecs*: 1.1.2.10 , 1.1.2.11 , 1.1.2.4 , 1.1.2.9 , 1.1.4.1 , 1.1.4.2 , 1.1.4.4 , 1.1.5 , 1.2.1 , 1.2.2.1 , 1.2.2.2 , 1.2.4.1 , 1.2.4.2 , 1.2.4.3 , 1.2.4.4 , 1.2.4.5 , 1.2.4.7 , 1.2.7.1 , 1.2.7.10 , 1.2.7.12 , 1.2.7.13 , 1.2.7.5 , 1.2.7.8 , 1.2.7.9 , 3.5 , 5.3.2 , 5.3.7 , 5.4.1 , 5.4.8 , 6.2.2 , 6.5.1 , 6.5.2 | |
| 1.6.3.1 | The Device Control function shall include a "real-time" traffic-adaptive control capability. |
| PSpecs*: 1.2.2.1 , 1.2.2.2 | |
| 1.6.3.2 | The real-time traffic-adaptive control portion of the Device Control function shall be an area wide control to include several jurisdictions. |
| PSpecs*: 1.2.2.1 , 1.2.2.2 , 5.3.2 , 5.3.7 , 5.4.1 , 5.4.8 | |
| 1.6.3.2.1 | The area wide control shall be implemented in an integrated and consistent manner that avoids the issuance of conflicting controls. |
| PSpecs*: 1.2.2.1 , 1.2.2.2 | |
| 1.6.3.2.2 | The area wide control shall be implemented in a manner that permits the following types of vehicles to have preference over other vehicles being controlled. |
| PSpecs*: 1.2.2.1 , 1.2.2.2 , 5.3.2 , 5.3.7 , 5.4.1 , 5.4.8 | |
| 1.6.3.2.2(a) | Transit. |
| PSpecs*: 1.2.2.1 | |
| 1.6.3.2.2(b) | HOV. |
| PSpecs*: 5.4.1 , 5.4.8 | |
| 1.6.3.2.2(c) | Emergency Medical Service Vehicles. |
| PSpecs*: 5.3.2 , 5.3.7 | |
| 1.6.3.3 | The Device Control function shall provide the capability to exercise control over those devices utilized for traffic control. |
| PSpecs*: 1.1.2.10 , 1.1.2.11 , 1.1.2.9 , 1.2.2.1 , 1.2.2.2 , 1.2.4.1 , 1.2.4.2 , 1.2.4.3 , 1.2.4.4 , 1.2.4.5 , 1.2.4.7 , 1.2.7.1 , 1.2.7.10 , 1.2.7.12 , 1.2.7.13 , 1.2.7.5 , 1.2.7.8 , 1.2.7.9 , 3.5 | |
| 1.6.3.3.1 | Device Control shall include the capability to control traffic signalization, including rapid modification of signalization parameters to respond to traffic requirements. |
| PSpecs*: 1.1.2.10 , 1.1.2.11 , 1.1.2.9 , 1.2.2.1 , 1.2.2.2 , 1.2.4.1 , 1.2.4.2 , 1.2.4.3 , 1.2.4.7 , 1.2.7.1 , 1.2.7.12 , 1.2.7.13 | |
| 1.6.3.3.2 | Device Control shall include the capability to dynamically control traffic signing. |
| PSpecs*: 1.1.2.10 , 1.1.2.11 , 1.1.2.9 , 1.2.2.1 , 1.2.2.2 , 1.2.4.1 , 1.2.4.2 , 1.2.4.3 , 1.2.4.4 , 1.2.4.7 , 1.2.7.1 , 1.2.7.12 , 1.2.7.13 , 1.2.7.5 , 1.2.7.8 , 1.2.7.9 | |
| 1.6.3.3.3 | Device Control shall include the capability to control freeway ramp metering. |
| PSpecs*: 1.1.2.10 , 1.1.2.11 , 1.1.2.9 , 1.2.2.1 , 1.2.2.2 , 1.2.4.1 , 1.2.4.2 , 1.2.4.3 , 1.2.4.7 , 1.2.7.12 , 1.2.7.5 , 1.2.7.8 | |
| 1.6.3.3.4 | Device Control shall include the capability to exercise dynamic control over the infrastructure (such as reversible-lanes, turning restrictions, etc.). |
| PSpecs*: 1.1.2.10 , 1.1.2.11 , 1.1.2.9 , 1.2.2.1 , 1.2.2.2 , 1.2.4.1 , 1.2.4.2 , 1.2.4.3 , 1.2.4.5 , 1.2.4.7 , 1.2.7.1 , 1.2.7.10 , 1.2.7.12 , 1.2.7.13 , 3.5 | |
| 1.6.3.4 | Device Control shall communicate control data to the following devices. |
| PSpecs*: 1.1.2.10 , 1.1.2.11 , 1.1.2.4 , 1.1.2.9 , 1.1.4.1 , 1.1.4.2 , 1.1.4.4 , 1.2.4.1 , 1.2.4.2 , 1.2.4.3 , 1.2.4.4 , 1.2.4.7 , 1.2.7.1 , 1.2.7.12 , 1.2.7.13 , 1.2.7.5 , 1.2.7.8 , 1.2.7.9 , 6.2.2 , 6.5.1 , 6.5.2 | |
| 1.6.3.4(a) | Traffic signals. |
| PSpecs*: 1.1.2.10 , 1.1.2.11 , 1.1.2.9 , 1.2.4.1 , 1.2.4.7 , 1.2.7.1 , 1.2.7.12 , 1.2.7.13 | |
| 1.6.3.4(b) | Ramp meters. |
| PSpecs*: 1.1.2.10 , 1.1.2.11 , 1.1.2.9 , 1.2.4.7 , 1.2.7.12 , 1.2.7.5 , 1.2.7.8 | |
| 1.6.3.4(c) | Information signs. |
| PSpecs*: 1.1.2.10 , 1.1.2.11 , 1.1.2.9 , 1.2.4.4 , 1.2.4.7 , 1.2.7.12 , 1.2.7.5 , 1.2.7.8 , 1.2.7.9 | |
| 1.6.3.4(d) | HOV lanes. |
| PSpecs*: 1.1.2.4 | |
| 1.6.3.4(e) | Human operator support. |
| PSpecs*: 1.1.4.2 , 1.1.4.4 | |
| 1.6.3.4.1 | Traffic Surveillance shall include a data process function to process the traffic data which are acquired. |
| PSpecs*: 1.1.2.10 , 1.1.2.11 , 1.1.2.9 , 1.1.4.1 , 1.2.4.1 , 1.2.4.2 , 1.2.4.3 , 1.2.4.7 , 1.2.7.12 , 6.2.2 , 6.5.1 , 6.5.2 | |
| 1.6.3.5 | Device Control shall provide the operator with the capability to manually override the system's automatic controls. |
| PSpecs*: 1.2.1 | |
| 1.6.3.6 | Device Control shall provide the operator the capability to adaptively change system response in order to provide a response that is coordinated with other TMCs responding to incidents. |
| PSpecs*: 1.1.5 , 1.2.1 | |
| 1.6.4 | Device Control shall provide traffic control information to other elements of the ITS, including but not limited to the following: |
| PSpecs*: 1.1.4.1 , 1.1.5 , 3.1.3 , 6.1.1 , 6.1.3 , 6.2.4 | |
| 1.6.4(a) | In-vehicle navigation. |
| PSpecs*: 1.1.4.1 , 1.1.5 , 3.1.3 | |
| 1.6.4(b) | Trip planning. |
| PSpecs*: 1.1.4.1 , 6.1.1 , 6.1.3 , 6.2.4 | |
| 1.6.4(c) | Routing systems. |
| PSpecs*: 1.1.4.1 , 6.1.1 , 6.1.3 , 6.2.4 | |
| 1.6.4(d) | Fleet management systems. |
| PSpecs*: 1.1.4.1 |
