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Connect & Drive is a start-up project to develop a cooperative driving system and improve the traffic performance on Dutch highways. It consists of two interactive subsystems: cooperative adaptive cruise control (CACC) and connected cruise control (CCC). To assess the traffic performance, a traffic simulation model will be established for large-scale evaluation and providing feedbacks to system...
Abstract-This paper compares the capacity analysis suggested by the Federal Highway Administration (FHWA) roundabout guidelines with those of the Transportation Research Board (TRB draft report, 2006) and National Highway Cooperative Research Program (NHCRP report 572). The result will be given in term of average control delay time, 95th percentile queue length, and capacity of the critical lane in...
Variable message signs (VMS), also known as changeable message signs (CMS) or dynamic message signs (DMS), are traffic control devices to communicate with motorists. A VMS is generally used to inform motorists the roadway, traffic, or weather conditions. It is also used to display travel times and public service announcements. This study attempts to utilize archived traffic data from the MRR1 freeway...
This paper proposes a Safety Spacing Policy (SSP) that can ensure safe operation while at the same time improving traffic flow for Adaptive Cruise Control (ACC) system. The proposed SSP, a nonlinear function of vehicle velocity, uses both the information of vehicle's state and braking capacity to adjust the position and velocity of the controlled vehicle. String stability, traffic flow stability and...
This paper presents a practical real-time traffic monitoring system based on object detection and tracking for measuring traffic parameters such as speed and volume. The system presented in this paper is a following work from our previous works in. This monitoring system is currently being used on real traffic environment in Thailand. The results in this paper confirm the validity of the proposed...
This paper presents a system entropy model for optimizing the number of tollbooths at highway toll plazas. Highways usually experience severe traffic congestion/jams at toll plazas since vehicles need to stop and wait for toll collection. It is noted that the number of tollbooths directly influences the traffic congestion. In order to obtain the optimal number of tollbooths, the concept of system...
Although vehicular ad hoc networks (VANETs) started mainly for safety applications, surprisingly very few work have been done in VANETs for automatic incident detection (AID) while most of the research went for developing routing protocols and privacy techniques. On the other hand, it is fundamentally difficult for most of the existing AID techniques to detect incidents in non dense traffic especially...
Past research has indicated that the effectiveness and efficiency of traffic control of signalized intersections strongly depend on the accurate calculation of saturation flow rate, particularly when demand approaches capacity. Minimal work has been done in the past on calibration of the parameters for saturation flow rate used in traffic control of signalized intersections. This paper discusses a...
Rapid response is the core function of the highway emergency assistance system and the corresponding reasonable dispatching of rescue resource can shorten the response time. This paper deals with the problem of dispatching emergency vehicles on the highway. Optimization model is formulated by regarding the generalized response time as decision-making object. The parameters of model include travel...
Safety is evergreen vital criteria for road traffic. We propose an infrastructureless solution based on contexts to increase safety of vehicle. Contexts characterize and track the moving environment of a vehicle. Here, environment means the vehiclepsilas own status like geographical position, break-controlpsilas functional status, driverpsilas status etc., and the status of neighboring vehicles. Contexts...
In this paper, an analytical dynamic node-based model is proposed both to represent flows on a highway traffic network and to be utilized as an integral part of a dynamic network loading (DNL) process by solving a continuous DNL problem. The proposed model formulation has an integrate base structured with a mesoscopic link load-computing component that explicitly takes into account the acceleration...
Information on the location of the phones can be used to estimate the speed at which the phones are moving. By tracking the speed variability of a substantial number of cell phones over time, the traffic flow characteristics of various highways can be estimated. A traffic flow estimation algorithm is developed by exploiting the occurrences of mobile handover which simulations are conducted with realistic...
In this paper it is presented a robust segmentation process for detecting incidents on highways. This segmentation process is based on background subtraction and uses an efficient background model initialization and update to work 24/7. A cross- correlation based shadow detection is also used for minimizing ghosts. It is also proposed a stopped vehicle detection system based on the pixel history cache...
As an important phase in the plan of Logistics Park, traffic volume forecast and traffic assignment are always the research focus.In this paper, the improved traffic volume non-repeated coefficient method was introduced to forecast the Traffic Volume of Logistics Park, based on the results, system optimization assignment model was used for traffic assignment of Logistics Park with the aid of TRANSCAD...
This paper presents a road occupancy rate based fuzzy logic for the control of transit vehicle at freeway ramp. The fuzzy logic, which has been applied broadly in urban intersection signal control, is used for transit vehicle control at Freeway Ramp in this paper. Different from the traditional measure which adjusts signal cycle by lengthening or shortening the green-time, we propose a red-time regulation...
The unique characteristics of highway intersections have caused them to be the most dangerous places in the road system. Complexity of causes of traffic crashes at highway intersections, difficulty in data collection of traffic accidents and traffic conflicts and many other reasons have made safety performance evaluation of highway intersections one of the most difficult tasks, in spite of the fact...
This paper describes a novel technique to analyze newly available Vehicle Traveling Data Recorder (VTDR) data from Passenger Transport Company. To help us be more conducive to study, we preprocessed the VTDR data firstly. 1) Algorithm that detects highway range in the VTDR data is proposed. 2) We transformed VTDR data from their original Time based Speed Series (TSS) to Location based Speed Series...
A definition of the disorder motion in traffic flow is given in order to quantitatively describe the disorder motion in traffic flow through analysis the concept of order motion and disorder motion. A measure model of disorder motion in traffic flow is put forward based on the traffic entropy. The measure model has been applied to analysis the disorder motion in traffic flow. Aim at the traffic flows...
Traffic conflict technique can be applied to quantitatively evaluate highway intersection traffic safety. The present study proposed that conflicts of different severity classes can be used in traffic safety evaluation when accident data are hard to acquire and the sample size of serious conflicts is not large enough. TTC (time to collision) was selected as index to judge the severity of conflicts...
Highways are an essential component of our society because they are critical to quality of life and to local and national economies. Under good conditions, highways provide a safe and efficient route for people and goods to reach their destinations. However, as a direct consequence of their use, traffic congestion is ever-increasing, undermining the ability of highways to adequately provide an acceptable...
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