e-journal

Freeway Traffic Modeling and Control in a First-Order Hybrid Petri Net Framework

---

The paper presents a model for freeway traffic performance evaluation and control in a First-Order Hybrid Petri Net (FOHPN) framework. Such a hybrid Petri net formalism includes continuous places holding fluid, discrete places containing a non-negative integer number of tokens and transitions, which are either discrete or continuous. In order to suitably describe the dynamics of the freeway traffic flow, we allow updating the transition firing speed as a function of the markings modeling the freeway traffic, as described by the stationary flow-density relationship. Moreover, we propose an online optimal control coordination of speed limits with the objective of maximizing the flow density. The use of FOHPNs offers several significant advantages with respect to themodel existing in the related literature: the graphical feature enables an easymodular modeling approach and themathematical
aspects efficiently allow simulating and optimizing the system. The effectiveness of the FOHPN formalism is shown by applying the proposed modeling and control technique to a stretch of a freeway
in the North-East of Italy, where a solution of an accident situation is considered. Note to Practitioners—The motivation of the present work is twofold. First, we propose a novel freeway system model in a FOHPN framework, in order to combine both the time-driven dynamics, considering the standard traffic fundamental diagram, and the event-driven dynamics, by modeling accidents, and recovery
procedures. Second, we suggest an online optimal control coordination of speed limits with the objective of maximizing the flow density. The obtained model and control strategies can be used on line, when the traffic is congested, to predict the future state and to manage the system by variable speed limits control. Hence, based on the knowledge of the system state and the information about the occurrence of unpredictable events, the model can enable the decision makers to evaluate decisions such as the
application of suitable recovery strategies after an accident or the choice of optimal speed limits in congested situations. Future research aims to investigate larger simulation campaigns describing
more complex real systems in order to refine the model and the control schemes.
Index Terms—First-order hybrid Petri nets (FOHPN), freeway traffic model, traffic control, variable speed limits.

---

Ketersediaan

Tidak ada salinan data

Informasi Detail

Judul Seri

IEEE TRANSACTIONS ON AUTOMATION SCIENCE AND ENGINEERING

No. Panggil

-

Penerbit

: ., 2014

Deskripsi Fisik

IEEE TRANSACTIONS ON AUTOMATION SCIENCE AND ENGINEERING, VOL. 11, NO. 1, JANUARY 2014

Bahasa

English

ISBN/ISSN

-

Klasifikasi

-

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

VOL. 11, NO. 1

Subjek

TEKNIK

Info Detail Spesifik

-

Pernyataan Tanggungjawab

yuli/agus

Versi lain/terkait

Lampiran Berkas

Komentar

---

Anda harus masuk sebelum memberikan komentar