Zsuzsanna Bede

Look-ahead cruise control design in VISSIM simulation environment

The paper deals with the design of individual vehicle speed, taking into account the topographical characteristics of the road, the speed limit and the current traffic conditions. The look-ahead speed selection algorithm is implemented in microscopic traffic simulation environment V ISSIM u sing COM interface and MATLAB programming. The proposed look-ahead control is tested and analyzed on one of main transportation roads in Hungary namely between Tatabánya and Györ. The main novelty of the paper is the implementation of the look-ahead control in a realistic traffic environment, where the benefits of the method can be tested during different traffic conditions.

Variable Network Model

Abstract Exploration and analysis of the possible application of state-dependent control through changing the structure of the above road traffic systems

THEORETICAL INVESTIGATION OF TRAFFIC EQUILIBRIUM ON BRIDGES

Abstract Road traffic flows on a straight road segment such as bridges are modelled in this article. The mathematical model of traffic flows has been constructed by using the method of lumped parameters. Changeable lane direction and road pricing has been theoretically investigated in order to understand the shifting in supply and/or demand curves of traffic participants in equilibrium. The article presents assumptions for constructing the mathematical model. Demand can be influenced by road pricing, in its turn, supply can be influenced by extension of infrastructure with reversible lanes.

Simulation-based analysis of mixed traffic flow using VISSIM environment

The paper presents the modelling of mixed traffic flow, in which look-ahead controlled vehicles with a speed control are driven together with conventional vehicles. Since the speed profile of the lookahead control may differ from that of the conventional vehicle, the structure of the traffic flow changes. The paper analyses the impact of vehicles applying look-ahead control strategy on the traffic flow. The analysis is performed by using the VISSIM traffic simulation software. In this simulation a highway section using real topographic data is also built in. In the paper the results of the simulation-based analysis are also illustrated.

Control design of traffic flow using look-ahead vehicles to increase energy efficiency

The paper presents a design strategy of the traffic flow with vehicles using look-ahead cruise control methods. The purpose of the coordination is to improve the energy efficiency of the vehicles, while the stability and the performance of the traffic system are guaranteed. The impact of the look-ahead cruise control on the traffic flow is analyzed. A new model concerning a polynomial form of the nonlinearity of the traffic flow is proposed, in which the look-ahead cruise control is constructed by a parameter-dependent model. Since the minimization of the energy demand of the traffic flow and the reduction of the queue length in the controlled lanes of the network lead to different solutions, a balance between these requirements must be achieved by an optimization procedure. In the optimal control of the traffic system the maximum Controlled Invariant Set based on the Sum-of-Squares (SOS) programming method is applied. The resulting set uses a selection of the intervention possibilities such as the input flow on the controlled gates and the optimization parameters of the look-ahead controlled vehicles. The high-fidelity VISSIM traffic simulator is applied to illustrate the results.

Optimizing Traffic Control for a Minimization of Fuel Consumptions and Emission Values

The emissions of harmful substances to the environment can be reduced in two ways. On one hand, by using the Adaptive Cruise Control (ACC) system of individual vehicles, on the other hand, by controlling the vehicles with the help of appropriate traffic control tools. These two approaches can be analysed in a complex model consisting of the models describing the behavior of the individual vehicles and determining the operation of the traffic network and the relationships between them.