 Telematics Applications for Transport Library
 Document item |
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 Title : |
TABASCO - TR1054 - Enhancement to Strategy Selection and Simulation Tools |
| Author : |
Jean-Marc Morin; Y. Zhou; S.Tarry |
| Ref. No : |
TR1054 D6.2 |
| Date : |
01/07/97 |
| Size : |
53 pages |
Exec Summary : |
The OPERA control approach developed jointly by ISIS and Steria provides a general picture of current and forecast traffic patterns and proposes a set of information or guidance messages on relevant Variable Message Signs (VMS) for incidents.
The VARIA assessment tool is based on OD-estimation procedures and is used to provide advice to motorists using Variable Direction Signs for optimal re-routing in inter-urban networks.
OPERA (Outil I'Exploitation d'un Reseau d'Autoroutes) has been designed as a tool able to automatically generate information and guidance messages on VMS throughout the network and to provide aid-to-decision to the operator via the simulation of his own strategies likely impact.
The strategy generation module SELECT, as soon as an incident is entered in OPERA by the operator (location, time of occurrence, number of lanes affected, likely duration of the lane obstruction), searches solutions in terms of relevant messages to be displayed on relevant VMS. Strategies are reconsidered each 6 minutes and modified if necessary.
Clearance of messages is also managed to give consistent clearance information to drivers already informed of the occurrence of the incident. Several incidents can be managed at the same time and long-term incidents (such as roadworks) can be specified so as not to interfere in the generation of strategies for "live" incidents.
The operator is also able to simulate on-line his own strategy, should some constraint, unknown by OPERA, prevent some message to be used on some VMS. In addition to on-line use, OPERA can be used off-line to simulate strategies, establish roadworks planning according to minimum disturbance constraints, quantify traffic situations and look for their trends, etc.
The new version of OPERA described within this Deliverable implements the functional specification and addresses user needs established at the start of TABASCO. It incorporates revised interfaces for the SELECT/SIMRES modules of OPERA and OPERA/NADICS and an improved MM1.
The new version of OPERA is now installed in the National Network Control Centre in Glasgow. It is being used for the management of VMS within the central belt area of Scotland.
The VARIA system has a modular structure, which consists of the different modules: data-management, situation analysis and prognosis, impact analyses, re-setting decision and communication. The main process is executed every five minute and starts with an OD-estimation on the basis of a rolling horizon with a time basis of 30 minutes. The next step is the analysis of the current situation. For a selected number of routes, detection of congestion or overload is processed. This information is used to reduce the number of strategies, which are tested and compared to each other by the prognosis module. This module uses a macroscopic traffic flow model and an emission model to compare the different strategies.
In Munich the VARIA system has been tested on-line and the impact of new user requirements identified at the beginning of TABASCO have been analysed. An off-line version of VARIA has also been applied to a test network in Nuremberg. VARIA is being further developed in the light of operational experience from both test sites.
This deliverable consists of 1 volume : tabasco d6.2.pdf |
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