Proceedings. The IEEE 5th International Conference on Intelligent Transportation Systems

Background subtraction is an efficient technique in vision-based traffic monitoring, it segments the moving vehicle from the video sequences by comparing the incoming frame to the model of background scene. The presented work is a simple approach of adaptive background modeling in which the short term memory (STM) and long term memory (LTM) are introduced to construct the whole background memory. ... View full abstract»

This paper presents an algorithm for detecting vehicles in FIX images. Initially the attention is focused on portions of the image that contains hot objects only. These areas are then selected and refined using aspect ratio and size constraints about vehicles; even situations with overlapping vehicles are considered. The result Is further investigated exploiting specific vehicle thermal characteri... View full abstract»

The paper shows that multiple correspondence analysis (MCA) is well suited to characterize the driver-vehicle-environment system. First, the complexity of this system is explained. Then partial models of this system are exposed followed by characterizing the methods. Among these methods, MCA has the required features to reveal what are the most relevant variables that could better characterize the... View full abstract»

This paper describes the concepts and system approach of FAMS, Flexible Agency for Collective Demand Responsive Mobility Services, a European project founded by the EU-IST Programme and operating in the Florence Metropolitan area. The objective of FAMS Project is to scale up the technology, service and business models currently adopted in demand responsive transport (DRT) and support the evolution... View full abstract»

Real-time network-level signal control, traffic assignment and route guidance are promising approaches for alleviating congestion. Different optimal sets of control parameters and strategies for area-wide signal control, traffic assignment and route guidance can be determined according to different traffic patterns using many methods. Because of the importance of pattern recognition of network-lev... View full abstract»

Through an overall analysis on the evaluation index system for highway network planning, the selection of evaluation indexes is realized by using an Analytical Hierarchy Process (AHP). The membership degree of non-quantitative indexes is determined by using a fuzzy statistical method, and quantitative evaluation indexes are determined based on the benefit index and the cost index The weight of the... View full abstract»

Intermodality in transportation systems is fast becoming a research topic of great interest. The computation of multiple paths in a multimodal network is desirable to identify efficient routes based on user preferences. This paper describes the clustering technique, which improves the performance of conventional k-shortest paths computations in multimodal transportation networks by first transform... View full abstract»

The importance of the traffic information collection system (TICS) in traffic control systems of urban freeways is analyzed. The advantages and disadvantages of some types of traffic detectors and data transmission methods are compared. For current TICS, wireless data transmission is suggested. In view of factors such as work principle, transmitting speed, and cost, the CDPD (Cellular Digital Pack... View full abstract»

We consider the problem of finding one to all minimum time paths for all departure times in a FIFO time dependent network with discrete arc travel times. We suggest that the problem can be viewed as a series of reoptimization of shortest path trees in static networks. This is accomplished via the concept of projection. We propose an algorithm which utilizes these projections to solve the one to al... View full abstract»

This paper explains a dynamic control system, which predicts deviations in bus operation and enables a transit controller to apply corrective control strategy prior to the actual occurrence of the variation. Two separated Kalman filter algorithms were used in the prediction-modeling framework of this system. Empirical Automatic Vehicle Location (AVL) and Automatic Passenger Counters (APC) data wer... View full abstract»

In this paper, an autonomous cruising traffic flow simulator including medium access control (MAC) for inter-vehicle communications (IVC) is constructed and the contention schemes are compared by using this simulator. The pure-ALOHA, slotted-ALOHA, and non-persistent CSMA schemes are simulated. The results of simulation show that the non-persistent CSMA is superior to the ALOHA schemes. This super... View full abstract»

In order to alleviate traffic congestion and reduce pollutants emission, developing advanced Beijing traveler information systems (Beijing-TIS) has become an urgent task at present. Firstly, the current status of Beijing-TIS Is reviewed. It is found that obvious gaps still exist compared with ATIS abroad. After defining the user services, a sound Beijing-TIS framework is proposed. It assembles rea... View full abstract»

A new iterative procedure with the consideration of the integrating stochastic factors is established for estimating origin-destination (OD) matrices. The analytical form of the link choice proportions is developed. By minimizing the squared errors between estimated and observed link flows, the mathematical model balances all degrees of approximation for restricted equations. The recursive least s... View full abstract»

A function to warn a drowsy driver is a prospective device to be included in intelligent transportation systems. We compared the eye closure rate (PERCLOS) with the vertical eye movement frequency between wakeful and drowsy states of drivers who were driving a car in a driving simulator. Three subjects participated in the experiment. In the drowsy state condition, both measures showed high values ... View full abstract»

This paper presents a method to estimate bus arrival times at bus stops using GPS information, which was implemented in the SITCUO-Information System for Urban Bus Transportation, in Brasilia. The model consists of a main algorithm and two sub algorithms to determine the position and the speed of the bus en route. When using the speed information from the GPS, the arrival time at the stop point wi... View full abstract»

More than half a million casualties are due to traffic accidents each year. Therefore, there is a high demand for innovative technologies focused on collision warning and collision avoidance. Among such technologies, the inter-vehicle communication and the vehicle-to-road communication are considered to have extensive potential for supporting the safety systems located within a vehicle. In this pa... View full abstract»

The differential global positioning system (DGPS) has been and will be used in several large-scale intelligent transportation systems projects in Singapore. This paper examines the availability and reliability of DGPS signal data in all the expressways, and two selected arterials, one bounded by tall residential apartment blocks and another parallel to an elevated mass rapid transit viaduct. The s... View full abstract»

For electronic payments, the communication link has to be reliable. Dedicated short range communication is a proposed solution for the automatic debiting of vehicles without disturbing the traffic flow. The reliability requirements of such a system are high, which implies that only large scale simulations with a lot of detail are effective to analyse an occasional error. In the article, a hierarch... View full abstract»

We present optimal routing policy (ORP) problems in stochastic and time-dependent networks where general travel costs are used as the optimization criterion. The presentation is an extension to the authors' previous work on ORP problems where travel times are considered as travel costs. Routing problems are at the heart of dynamic traffic assignment models, and are also fundamental network optimiz... View full abstract»

Statistical acceleration and deceleration distributions are developed as a function of speed and road type. The approach allows for the estimation of acceleration and deceleration variation among vehicles on a link with a given speed. Acceleration is shown to be a random variable that follows a probabilistic distribution that is practically independent of the road type. For the given data set, thi... View full abstract»