SIMULATION STUDIES OF INTEGRATED CORRIDOR CONTROL IN GLASGOW CHRISTINA DIAKAKI, MARKOS PAPAGEORGIOU Dynamic Systems and Simulation Laboratory, Technical University of Crete, 73100 Chania, Greece and TOM MCLEAN Strathclyde Regional Council, Strathclyde Roads, Richmond Exchange, 20 Cadogan Street, Glasgow G27AD, UK (Received 29 April 1996; in revised form 3 March 1997) AbstractÐThe paper presents the work performed within the European DRIVE II Project EUROCOR (European Urban Corridor Control) in relation to modelling and integrated control of the M8 Eastbound Corridor in Glasgow. The main intention of the study was not the design of new control strategies but the investigation of the qualitative impact of various control measures such as ramp metering, route diversion via variable message signs and signal control, and of their integration under realistic conditions. To this end, several scenarios of included control measures were investigated using the macroscopic modelling tool METACOR (ModeÁle d'Ecoulement du Tra®c sur Coridor), demonstrating the issues and potential bene®ts arising from dierent levels of integration. # 1997 Elsevier Science Ltd. All rights reserved. 1. INTRODUCTION Integration has been one of the main issues of European and worldwide activities related to Advanced Trac Management Systems (ATMS). Integration may address a number of dierent aspects including: . Integrated modelling of trac processes. . Integrated design of control strategies. . Integration of software components. . Integration of communication and hardware facilities. . Integration (interconnection) of control centers. . Administrative aspects of system integration. With respect to control strategy design, we may distinguish a hierarchy of integration levels as follows: Level 0: completely independent design of control applications. Level 1: independent design of control applications taking into account existence and requirements of other applications in the network. Level 2: decentralized design of control applications based on real-time mutual exchange of measurements and decisions. Level 3: coordination of individual control applications by an independent, hierarchically superior unit. Level 4: fully integrated design of control applications. Although some advanced methodologies have been recently suggested for level 4 integration (Papageorgiou, 1995), practical applications have to face a number of technical and administrative diculties before reaching this level. In fact, empirical evidence related to the needs, the cost± bene®t assessment, and the technical diculties of system integration are largely lacking. This paper describes the work performed within the European DRIVE II project EUROCOR (European Urban Corridor Control) in relation to modelling and integrated control of the M8 Eastbound Corridor (M8EC) in Glasgow. The main goal of the study was to contribute to the understanding of interconnections, potential bene®ts, and procedures of integrated corridor con- trol, taking into account ramp metering, route diversion via variable message signs (VMS), and signal control. The attempted control integration should be located at level 2. Continuation, ®eld implementation, and extension of the described integration procedures are intended to reach level 3 and beyond within the DRIVE III project TABASCO (Telematics Applications in Bavaria, Scotland and Others). Transpn Res.-C, Vol. 5, No. 3/4, pp. 211±224, 1997 # 1997 Elsevier Science Ltd Pergamon All rights reserved. Printed in Great Britain PII: S0968-090X(97)00008-9 0968-090X/97 $17.00+0.00 211