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Microsimulation
Microsimulation (from microanalytic simulation or microscopic simulation) is a category of computerized analytical tools that perform highly detailed analysis of activities such as highway traffic flowing through an intersection, financial transactions, or pathogens spreading disease through a population. Microsimulation is often used to evaluate the effects of proposed interventions before they are implemented in the real world. For example, a traffic microsimulation model could be used to evaluate the effectiveness of lengthening a turn lane at an intersection, and thus help decide whether it is worth spending money on actually lengthening the lane. Introduction Microsimulation can be distinguished from other types of computer modeling in looking at the interaction of individual ''units'' such as people or vehicles. Each unit is treated as an autonomous entity and the interaction of the units is allowed vary depending on stochastic (randomized) parameters. These parameters a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dynamic Microsimulation Pension Model
A dynamic microsimulation pension model is a type of a pension model projecting a pension system by means of a microsimulation and generating the complete history of each individual in a data set. The results of such model offer both the aggregate (e.g. total replacement ratio, implicit debt) and individual indicators (e.g. individual cash-flows) of the pension system. Thanks to complexity of results, there is a possibility to investigate the distribution of pensions, poverty of pensioners, impact of the changes of the pension formula, for more examples see e.g. (Deloitte, 2011). Detailed individual set of (administrative) data should serve as a model input. Dynamic Microsimulation Pension Models A dynamic microsimulation pension models (or a dynamic model with dynamic ageing) is a type of a pension model – see its pension model#Taxonomy of the Pension Models, taxonomy and also (Gál, Horváth, Orbán, & Dekkers, 2009) . There are two basic types of this kind of model - (i) de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CORSIM
TSIS-CORSIM is a microscopic traffic simulation software package for signal systems, highway systems, freeway systems, or combined signal, highway and freeway systems. CORSIM (CORridor SIMulation) consists of an integrated set of two microscopic simulation models that represent the entire traffic environment. NETSIM represents traffic on urban streets. FRESIM represents traffic on highways and freeways. Microscopic simulation models the movements of individual vehicles, which include the influences of geometric conditions, control conditions, and driver behavior. TSIS (Traffic Software Integrated System) is an integrated development environment that enables users to conduct traffic operations analysis. Built using a component architecture, TSIS allows the user to customize the set of included tools, define and manage traffic analysis projects, define traffic networks and create inputs for traffic simulation analysis, execute traffic simulation models, and interpret the resu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TransModeler
TransModeler is the name of a based traffic simulation platform for doing wide-area traffic planning, traffic management, and emergency evacuation studies that is developed by Caliper Corporation. It can animate the behavior of multi-modal traffic systems to show the flow of vehicles, the operation of traffic signals, and the overall performance of the transportation network. About TransModeler TransModeler is a traffic simulation package applicable to a wide array of traffic planning and modeling tasks. TransModeler can simulate many kinds of road networks, including freeways and downtown areas, and can analyze wide-area multimodal networks. It can be used to model and visualize the behavior of traffic systems in a 2-dimensional or 3-dimensional GIS environment to illustrate and evaluate traffic flow dynamics, traffic signal and ITS operations, connected and automated vehicles (CAVs), and overall network performance. Like other Caliper Corporation products, TransModeler is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microscopic Traffic Flow Model
Microscopic traffic flow models are a class of scientific models of vehicular traffic dynamics. In contrast, to macroscopic models, microscopic traffic flow models simulate single vehicle-driver units, so the dynamic variables of the models represent microscopic properties like the position and velocity of single vehicles. Car-following models Also known as ''time-continuous models'', all car-following models have in common that they are defined by ordinary differential equations describing the complete dynamics of the vehicles' positions x_\alpha and velocities v_\alpha. It is assumed that the input stimuli of the drivers are restricted to their own velocity v_\alpha, the net distance (bumper-to-bumper distance) s_\alpha = x_ - x_\alpha - \ell_ to the leading vehicle \alpha-1 (where \ell_ denotes the vehicle length), and the velocity v_ of the leading vehicle. The equation of motion of each vehicle is characterized by an acceleration function that depends on those input stimul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quadstone Paramics
Paramics is traffic microsimulation software, originally developed by Quadstone Ltd. There is a related pedestrian microsimulation product called the Urban Analytics Framework. Background The Paramics project was originally established in the early 1990s by the UK Department for Transport and was further developed as a project by the Edinburgh Parallel Computing Centre, based at the University of Edinburgh. By the mid 1990s, some of the project staff left to form Quadstone Limited. A partnership was formed between Quadstone Limited and SIAS but was quickly dissolved in 1998 as both parties could not agree on the direction of the partnership. In 2005, Quadstone was acquired by Portrait Software. Today, Quadstone Paramics operates as an autonomous division within Pitney Bowes Business Insight. The software evolved into Paramics Discovery which is now managed by Systra. Concept Paramics was created from scratch based on several models and mainly on the paper “A model for tra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PTV VISSIM
PTV Vissim is a microscopic multi-modal traffic flow simulation software package developed by PTV Planung Transport Verkehr AG in Karlsruhe, Germany. The name is derived from "Verkehr In Städten - SIMulationsmodell" (German for "Traffic in cities - simulation model"). PTV Vissim was first developed in 1992 and is today a global market leader. Scope of application The scope of application ranges from various issues of traffic engineering (transport engineering, transportation planning, signal timing), public transport, urban planning over fire protection ( evacuation simulation) to 3d visualization ( computer animation, architectural animation) for illustrative purpose and communication to the general public. PTV Vissim is part of the PTV Vision Traffic Suite which also includes PTV Visum (traffic analysis and forecasting) and PTV Vistro (signal optimisation and traffic impact). Modelling Microscopic simulation The basic traffic model ruling the movement of vehicles was devel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Traffic Flow
In mathematics and transportation engineering, traffic flow is the study of interactions between travellers (including pedestrians, cyclists, drivers, and their vehicles) and infrastructure (including highways, signage, and traffic control devices), with the aim of understanding and developing an optimal transport network with efficient movement of traffic and minimal traffic congestion problems. History Attempts to produce a mathematical theory of traffic flow date back to the 1920s, when Frank Knight first produced an analysis of traffic equilibrium, which was refined into Wardrop's first and second principles of equilibrium in 1952. Nonetheless, even with the advent of significant computer processing power, to date there has been no satisfactory general theory that can be consistently applied to real flow conditions. Current traffic models use a mixture of empirical and theoretical techniques. These models are then developed into traffic forecasts, and take account of p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Interchange (road)
In the field of road transport, an interchange (American English) or a grade-separated junction (British English) is a road junction that uses grade separations to allow for the movement of traffic between two or more roadways or highways, using a system of interconnecting roadways to permit traffic on at least one of the routes to pass through the junction without interruption from crossing traffic streams. It differs from a standard intersection, where roads cross at grade. Interchanges are almost always used when at least one road is a controlled-access highway (freeway or motorway) or a limited-access divided highway (expressway), though they are sometimes used at junctions between surface streets. Terminology ''Note:'' The descriptions of interchanges apply to countries where vehicles drive on the right side of the road. For left-side driving, the layout of junctions is mirrored. Both North American (NA) and British (UK) terminology is included. ; Freeway junction, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sidra Intersection
Sidra Intersection (styled SIDRA, previously called Sidra and aaSidra) is a software package used for intersection (junction) and network capacity, level of service and performance analysis, and signalised intersection and network timing calculations by traffic design, operations and planning professionals. History First released in 1984, it has been under continuous development in response to user feedback. Version 6.0 released in April 2013 added network modelling capability and new vehicle movement classes. Version 7.0 released in April 2016 included new timing analysis methods for Common Control Groups (multiple intersections operating under one signal controller) and Network Cycle Time and Signal Offset calculations for signal coordination. Version 9.0 released in May 2020 included improved network model processing efficiency and workflow efficiency through substantial user interface enhancements and model improvements. The latest Version 9.1 introduced important traffic mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TRANSYT-7F
TRANSYT-7F is a traffic simulation and signal timing optimization program. The primary application of TRANSYT-7F is signal timing design and optimization. TRANSYT-7F features genetic algorithm optimization of cycle length, phasing sequence, splits, and offsets. TRANSYT-7F combines a detailed optimization process (including genetic algorithm, multi-period, and direct CORSIM optimization) with a detailed macroscopic simulation model (including platoon dispersion, queue spillback, and actuated control simulation). History TRANSYT-7F is an acronym for TRAffic Network StudY Tool, version 7F. The original TRANSYT model was developed by the Transport Research Laboratory in the United Kingdom. TRANSYT, version 7 was "Americanized" for the Federal Highway Administration (FHWA); thus the "7F." The TRANSYT-7F program and the original TRANSYT-7F manual were developed for the Federal Highway Administration (FHWA) under the National Signal Timing Optimization Project (NSTOP) by the Un ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
