Download - Investigacion Funcion Retardo Virginia
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Investigacin de la Relacion velocidad de flujo y Estimacin de funciones de retardo volumen para los modelos de demanda de viajes en VirginiaTRB Planning Applications Conference - May 19, 2009Presented by:Jaesup Lee, Virginia Department of TransportationDean Munn, The Corradino Group
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
IntroductionLos datos sobre trfico utilizados en el anlisis y la estimacin del modelo bsicoDesarrollo de Datos y DefinicinVelocidad de Flujo LibreFlujo Trafico (Ininterrumpido vs. Interrumpido)Link Capacity Varios accesorios Curva de Clase Funcional
Findings and Further Research
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
IntroduccionObjetivos del Proyecto
Utilizar los datos empricos obtenidos de las instalaciones de Virginia para evaluar las relaciones de flujo de velocidad
Pruebe diferentes formas funcionales volumen de retardo para cada tipo de establecimiento y determinar cul ofrece el mejor rendimiento
Calibrar parmetros de la funcin de retardo de volumen para cada tipo de establecimiento
Resultado debe ser adecuado para su aplicacin en modelos de desplazamiento urbano Virginia
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
IntroductionElementos Fundamentales de Volumen-Delay Estimacin La conversin de velocidades puntuales a la velocidad espacial media Caractersticas de flujo libre La identificacin de lmite entre flujo ininterrumpido y interrumpido Utilizando el conocimiento de esta frontera para estimar el caudal mximo sostenible (Estadio) Utilice observaciones empricas para adaptarse parmetros de la curva de VDF
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Traffic Monitoring System (TSM) Data5.848 poblaciones de 17.400 ubicaciones de detectores disponibles Tres ubicaciones seleccionadas por clasificacin
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Datos de TraficoLos registros de datos son un resumen de cada perodo de 15 minutos Contenedores de velocidad son en incrementos de 5 mph Los registros de datos se organizan por carril y clase de vehculoGuin CUBO / Voyager simplifica datos Velocidades planos se convierten a plazos Espacio Mean
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Procesamiento de DatosSpeed vs DensitySpeed vs FlowSpeed by Time of Day
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Estimacion del Flujo Velocidad LibreHCM recomienda el uso de valor medio para condiciones de bajo volumen 2.La prctica estndar tambin incluye el uso de la velocidad percentil 8571.1 mph73.7 mph
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Definicion de Flujo InterrumpidoPloteo de flujo vs densidad y velocidad vs densidad muestran dos estados de flujo Otros han definido el punto de transicin como el flujo mximo o la densidad a la velocidad mxima, pero esto no es representativo de las condiciones tpicas. Las tcnicas estadsticas pueden definir la transicin entre los dos estadosbetween the two statesFlow vs. DensitySpeed vs. DensityInterrupted FlowInterrupted Flow
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Definicion de Flujo interumpidoNosotros definimos el flujo interrumpido como: Cualquier velocidad por debajo del umbral donde hay 0,0001% de probabilidad que es el mismo que Flujo libre.
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Defining Interrupted FlowEjemplo Autopista rural, con estados de flujo identifica
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Interrupted FlowHistogram Percent with Interrupted Flow vs. Flow Density
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Estimacion de la capacidadNuestros datos muestran una distribucin logstica clsica Estimamos los parmetros (utilizando la densidad como la nica variable) para crear una funcin de probabilidad que mejor se ajusta a los datos
Capacidad corresponde a fluir densidad con un 50% de probabilidad de ser interrumpidoPI = 1/[1 + e(b1D+ b0)], where D = Density (veh/mi)
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
99.5% Probability of Interrupted Flow0.50% Probability of Interrupted Flow50.0% Probability of Interrupted FlowCapacity EstimatesThis example gives a 39.7 pc/mi Density Threshold or a 2384 pc/hr Max Flow Rate
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Fitting Volume Delay FunctionsVolume-Delay Functions - Using the computed capacity, the following volume delay functions were estimated based on speeds during uninterrupted flow
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Curve de Ajuste- Regresion no Lineal
Bondad de Ajuste R-squared Root Mean Square ErrorPruebas no parametricas e.g. Chi-cuadrado
Other Criteria - suitability for model applicationsAjuste a la Funcion Volume Delay
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Fitting Volume Delay FunctionsUrban Interstate
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Fitting Volume Delay FunctionsRural Interstate
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Ajuste a la function Volume DelayUrban Expressway
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Fitting Volume Delay FunctionsRural Principal Arterial
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Fitting Volume Delay FunctionsUrban Other Principal Arterials
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Fitting Volume Delay FunctionsRural Minor Arterial
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Fitting Volume Delay FunctionsUrban Minor Arterial
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Fitting Volume Delay FunctionsRural Collector
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Fitting Volume Delay FunctionsUrban Collector
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Fitting Volume Delay FunctionsRural Local
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Fitting Volume Delay FunctionsResumen de los Ingresos calibrados por un proceso ajuste to VDF
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Fitting Volume Delay FunctionsSummarized results from VDF fitting process
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Hallazgos InicialesLas funciones estndar de VDF son capaces de realizar de manera adecuada a travs de clases de carreteras Para una clase de carretera dado, parmetros VDF provistos por cada poblacin, parecen ser transferibles a otros lugares La bondad de las medidas de ajuste no diferencian fuertemente entre las funciones La funcin Akcelik, con sus ms rigurosos fundamentos tericos, parece que funciona muy bien
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Next StepsTipos de instalaciones adicionales Compruebe modelo transferibilidad a otras instalaciones Comparar la capacidad de HCM, la capacidad de planificacin y capacidad emprica Continuar para automatizar el proceso de anlisisFunciones de prueba en modelos urbanos (convergencia asignacin, velocidades de viaje promedio) Nuevas formas funcionales VDF y parmetros calibrados se convertir en parte estndares de modelado de VDOT
Investigation of Speed-Flow Relations and Estimation of Volume Delay Functions for Travel Demand Models in Virginia TRB Planning Applications Conference, May 19, 2009
Q & A
Thank you !
Contact pointsJaesup Lee: [email protected] Munn: [email protected] Raw : [email protected]
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