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Supporting QoS for safety-critical applications for intelligent transportation systems accentuates the analytical modeling of delays in vehicular networks. Such analysis is, however, challenging due to the dynamics of such a network. We make progress by deriving lower- and upper-bounds for information dissemination delays in multi-hop vehicular networks using two different routing schemes. In particular,...
Supposed the perception of traffic information and the controlling decision of vehicles are correct. The delay of controlling actions is researched in the paper, and the function of driver non-response probability is advanced. Based on the function, the timing curve of divers' response is made. Then the risk model of Rear-ends accidents is established to evaluate the probability of Rear-end accident,...
Measuring control delay at signalized intersections accurately is very important for designing and operating traffic control systems. At present, we usually maintain control delay through observing on the spot or model calculating. However, the control delays obtained by these methods are not accurately and in real time. In the recent years, the development of vehicle infrastructure integration system...
Taking a road intersection in the front of Harbin province government as an example and combining with the road capacity of Harbin in winter, the microscopic simulation of traffic flow is conducted using VISSIM. The reason of traffic jams in the road intersection is found out. Different solutions to solve it such as Intersection channelization and signal timing are proposed. They are compared and...
Fully autonomous vehicles are technologically feasible with the current generation of hardware, as demonstrated by recent robot car competitions. Dresner and Stone proposed a new intersection control protocol called Autonomous Intersection Management (AIM) and showed that with autonomous vehicles it is possible to make intersection control much more efficient than the traditional control mechanisms...
An application that uses reinforcement learning (RL) agents for traffic control along an arterial under high traffic volumes is presented. RL agents were trained using Q learning and a modified version of the state representation that included information on the occupancy of the links from neighboring intersections. The proposed structure also includes a reward that considers potential blockage from...
This paper addresses the problem of efficient data dissemination in Vehicular Ad Hoc Networks (VANETs), which particularly suffer from changing densities in the network topology due to congested and sparse traffic on the roads. We present a new network layer protocol in the family of geographic network protocols, which makes use of distance and time information following a dissemination strategy to...
This paper presents a promising application of Vehicle-Infrastructure Integration, in which arterial travel time are estimated in real-time. In this application, information collected through the V-I communication is utilized in concert with that collected by conventional point-based detectors. Two VII probe data (VPD) models have been developed and customized for the latest VII probe message standard...
Service reliability is one of the main measures of performance determining transit system level of service. Holding control strategies are a common transit operations practice aimed to reduce transit service unreliability by setting criteria for departure from time point stops. In order to adequately analyze the sources of uncertainty involved with transit performance, it is essential to model dynamically...
The purpose of timing plan optimization is to decrease delay and increase the overall performance of transportation network. This paper presents an agent-based reinforcement learning framework to train optimization agents to take appropriate actions according to perceived traffic states. Neuro-Fuzzy Actor-Critic Reinforcement Learning (NFACRL) method is applied in isolated intersection control. The...
Many applications and protocols are planned for the so-called Intelligent Transportation Systems (ITS). Most of them are supposed to work in dynamic networks, such as the vehicular ad hoc networks (VANET). However, designing and studying distributed applications and protocols in such networks is not easy. Analytical studies suffer from the lack of pertinent models. Simulations are often far from reality...
The linguistic description of a physical phenomenon is a summary of the available information where certain relevant aspects are remarked while other irrelevant aspects remain hidden. This paper deals with the development of computational systems capable to generate linguistic descriptions from images captured by a video camera. The problem of linguistically labeling images in a database is a challenge...
Dynamic link impedance is an important base for dynamic traffic assignment problem. Link travel time is the main constituent of link impedance and is often directly used as link impedance. Considering the disadvantages of traditional estimation methods based on floating car, proposed an improved method to improve the accuracy of the estimates. To Sydney Coordinated Adaptive Traffic System, its detection...
This paper optimizes expressway emergency traffic organization programs. Firstly, this paper analyzes partial traffic state of expressway traffic accident, and then summarizes the influence and spread laws of expressway traffic accident. Furthermore, this paper divides expressway traffic accident influential zones into protection zone, control zone and buffer. Then, the paper establishes emergency...
Vehicular wireless networks have emerged as a promising wireless communication technology in recent years. Vehicular wireless networks collect information on real-time traffic, such as the road situation, the location of a car accident, etc., which must be delivered to its destination before a set deadline in order to be useful for an Intelligent Transportation System (ITS). Target applications are...
Vehicular Ad Hoc Network (VANET) is an emerging new technology and a promising platform for the Intelligent Transportation System (ITS). The most important application of VANET is disseminating emergency messages to warn drivers in case of dangerous events. The core technique relies on the design of a broadcast scheme. In this paper, we propose a street-based broadcast scheme that is suitable for...
Signalized intersection delay is an important evaluation index of the signalized intersection capacity and service level. This paper presents a signalized intersection delay model for signalized intersection. The model uses the methods which combine the RBF neural network with stochastic service system, and also uses MATLAB for computing simulation. It discusses the characteristics of the operation...
Along with urbanization, traffic congestion increasingly affects people. Evaluation index is of great value to describe traffic jams of the city's road network or specific region, but in the field of the road intersection, current study on evaluation indicators does not sound. In this paper, point sample method is adopted to conduct field estimation on five districts and 15 Intersections of Beijing...
As the converging point and evacuating point of traffic flow, the service level of intersection is closely related to the explicit costs the drivers can bear in passing the intersection. This article applying point sample method to 5 districts and 15 intersections of Beijing and using regression analysis to propose intersection congestion index, can dynamically reflect the degree of intersection congestion;...
We present a road monitoring and alert system implemented using a novel Geocache concept to enable efficient spatial monitoring in a mobile distributed sensing scenario. Technology trends have led to the integration of positioning, communications, and sensing capabilities into mobile entities such as cars and cellular phones, enabling them to monitor and report on their surroundings. We consider scenarios...
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