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To help with the planning of intervehicular communication networks, an accurate understanding of traffic behavior and traffic phase transition is required. We calculate intervehicle spacings from empirical data collected in a multilane highway in California, USA. We calculate the correlation coefficients for spacings between vehicles in individual lanes to show that the flows are independent. We determine...
In the process of highway operation, huge energy consumption occurs and a lot of pollutant will be emitted. To get an intuitive impression on spatial and temporal distribution of energy consumption and emissions, an energy consumption and emissions accounting model based on multiple sensors are provided, which can be used for detection, analysis and management of energy consumption and pollutant emission...
In this paper, simplified EV power train models are developed for new and existing production vehicles. The models are developed based on published vehicle parameters and range information for the Nissan Leaf and the Tesla Roadster. The models are compared with published manufacturer specifications for range under various route and driving conditions, and for various drive cycles. The models are additionally...
ITS systems can help reduce CO2 emissions in three different ways, which need to be evaluated using different modeling paradigms. The ITS systems that reduce demand for vehicle travel should be analyzed using regional transportation planning models that explicitly represent modal choice and pricing sensitivity of travel choices. The ITS systems that improve vehicle operating efficiency should be evaluated...
Simulation is a strong tool for traffic engineers to investigate phenomena, to test control strategies and their impacts, but it also has its limitations. The data needed to calibrate the simulation is limited, mostly from low quality, or - when looking into behavior - not available at all. For the latter on, methods ranging from simple surveys to highly technical experiments in driving simulators...
With the expressway network density increasing and high-speed railway opening, the transport service capacity grows fast, which also leads to more and more intense competition of various passenger transports. In this paper, we build the passenger transport model and also add Metrics in LOGIT model based on the selection of all travel methods, in considering the influence of traveler income, trip purpose...
We structured compound dynamics simulation model demanding highway conveyance force, made computer trends simulation. Based on the result, we tentatively calculated logistic storage and that demanding highway conveyance force.
This article paid more attention to the confliction of the flowing in and out for the circle, and put forward new methods to control vehicles flow by setting temporary parking area (abbreviated as TPA) in the circle and setting traffic lights. The multiple goal function emphasizes the principle that the number of the waiting vehicles is the least and while the efficiency of the vehicles out of the...
This paper introduces the development of a web-based decision support system, to facilitate human factor studies regarding the use of changeable message signs (CMS). A microscopic traffic simulator VISSIM was used to generate realistic simulation scenarios with various CMS alternatives implemented. A case study for truck mounted changeable message sign on an urban multilane highway for ldquoright...
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...
Transportation will be increasingly vital in China as the nation's economy continues to change from a planned, centralized system to one that is market-based and decentralized. In this paper, we propose a Data Envelopment Analysis (DEA) approach to evaluate Transportation System Efficiency (TSE) for 31 major regions (including 23 provinces, 4 municipalities and 4 autonomous regions) in China. This...
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...
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...
Road accidents are one of the most important problems being faced by modern societies. Apart from the humanitarian aspect of reducing road deaths and injuries in developing countries, a strong case can be made for reducing road crash deaths on economic grounds alone, as they consume massive financial resources that the countries can ill afford to lose. The deaths of persons and serious economic loss...
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