Two-lane Two-lane highways
Highway Capacity Manual 2010
Capítulo15
CONTENIDO
1
INTRODUCCION
Las carreteras de dos carriles tienen un carril para el uso de tráfico en cada direccin! La cara caract cter erís ísti tica ca prin princi cipa pall "ue "ue dife difere renc ncia ia las las carr carret eter eras as de dos dos carr carril iles es de otra otras s infraestructuras #iales de flu$o ininterru%pido para el tráfico de #ehículos auto%otores es "ue las %anio&ras de paso paso tienen lugar en el carril opuesto de de tráfico! Las %anio&ras %anio&ras de paso están li%itadas por la disponi&ilidad de algunos inter#alos en el flu$o de tráfico opuesto y por la disponi&ilidad de suficiente distancia de #isi&ilidad para "ue un conductor pueda discernir la apro'i%acin de un #ehículo del tráfico opuesto de for%a segura! Cuando la de%anda del flu$o #ehicular y las restricciones geo%(tricas au%entan) las oportunidades de paso dis%inuyen! *sto crea pelotones dentro del flu$o #ehicular por #ehículos pesados pesados su$etos a de%ora adicional por la incapacidad de adelantar el #ehículo "ue #a adelante! +e&ido +e&ido a "ue las posi&ili posi&ilidad dades es de adelant adelanta%ie a%iento nto dis%inuy dis%inuyen) en) las carretera carreteras s de dos carrile carriles s presen presenta tan n una una carac caracte terís rístic tica a ,nica ,nica la calida calidad d de opera operaci cin n dis%in dis%inuy uye e precipit precipitada ada%ent %ente e a %edida %edida "ue au%enta au%enta la de%and de%anda a de flu$o flu$o y las operacione operaciones s de so&repaso son .i%posi&les/ a relati#a%ente &a$as relaciones de #olu%en - capacidad! or esta ran) pocas carreteras de dos carriles operan a flu$os #ehiculares "ue se apro'i%an la capacidad en la %ayoría de los casos) la %ala calidad de operacin ha lle#ado a %e$ora %e$ora%ie %iento nto o recon reconstr strucc uccin in de la carre carreter tera a antes antes de alcan alcanar ar la de%an de%anda da de capacidad! La calidad del ser#icio para las &icicletas se #e afectada principal%ente principal%ente por la #elocidad y #olu%en de tráfico "ue fluye adyacente y por el grado de separacin entre ciclista y #ehículo auto%otor tráfico per%itida por la geo%etría de la carretera! *l Capítulo 15) de carreteras de dos carriles) presenta %etodologías para el análisis) dise dise3o 3o y plan planif ific icac aci in n de las las carr carret eter eras as de dos dos carr carril iles es "ue "ue oper operan an &a$o &a$o flu$ flu$o o ininterru%pido) ininterru%pido) tanto para auto%#iles auto%#iles co%o &icicletas! *'iste flu$o ininterru%pido ininterru%pido cuando no hay dispositi#os de control de tráfico "ue interru%pen el tráfico y donde no se for%an pelotones por intersecciones se%aforiadas! *n general) cual"uier tra%o "ue está a dos o tres %illas de una interseccin interseccin se%aforiada se%aforiada enca$aría en esta esta categoría! categoría! Cuando hay intersecciones intersecciones se%aforiadas se%aforiadas a %enos de 4)2 % de distancia) la #ía de&e ser clasificada co%o calle ur&ana ur&ana y analiada con con las %etodologías %etodologías del capítulo capítulo 16) 7ías 8r&anas 8r&anas y el Capítulo 19) tra%os de #ía ur&ana) "ue se encuentra en el 7olu%en 7olu%en 4! :e supone "ue no se presentan %anio&ras de adelanta%iento por carriles opuestos en #ías ur&anas! *l Capítulo 15 ta%&i(n incluye una %etodología para predecir el efecto de so&repaso y carriles para adelanta%iento de #ehículos pesados en carreteras de dos carriles!
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Highway Capacity Manual 2010
Two-lane Two-lane highways
Capítulo15
Características de carreteras de dos carriles
;unciones de las carreteras de dos carriles en siste%as de carreteras Las carreteras de dos carriles son ele%ento cla#e en los siste%as de carreteras de la %ayoría de los estados y condados! condados! *stán u&icados diferentes áreas geográficas geográficas y sir#en una a%plia #ariedad #ariedad de funcion funciones es de tráfico! tráfico! Las carreter carreteras as de dos carriles ta%&i(n ta%&i(n cu%plen cu%plen una serie de #ia$es #ia$es en &icicleta &icicleta)) en particula particularr #ia$es #ia$es recreat recreati#os i#os!! Cual"uie Cual"uier r consideracin de calidad de operacin de&en tener en cuenta estas funciones! La Mo#il Mo#ilida idad d efici eficien ente te es la funci funcin n princ principa ipall de las carret carretera eras s de dos dos carri carriles les "ue "ue conectan los principales generadores de #ia$es o "ue sir#en co%o enlaces pri%arios por e$e%plo la red nacional de carreteras! *stas rutas tienden a ser#ir distancias largas y #ia$es co%erciales y de recreacin y largos tra%os pueden pasar a tra#(s de las onas rurales sin interrupciones por control de tráfico!
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Highway Capacity Manual 2010
Two-lane Two-lane highways
Capítulo15
Clasificación de las carreteras de dos carriles
+e&ido +e&ido a la a%plia ga%a ga%a de acti#ida acti#idades des ser#idas ser#idas por carretera carreteras s de dos carriles) carriles) la %etodología para auto%#il esta&lece tres clases de carreteras! Las dos pri%eras clases a&ordan carreteras de dos carriles rurales! La %etodología para ellas se desarroll co%o parte de la @ational Cooperati#e Highway Aesearch rogra% >@CHA? royecto 4-55 >4? en 1BBB >1? y re#isado co%o parte de @CHA royecto 20-9 >160? in 2004 >2?! La tercera clase a&orda las carreteras de dos carriles en áreas desarrolladas! *l análisis para estas carreteras se enfocan a una %odificacin del %(todo para carreteras rurales se3alado anterior%ente y fue desarrollado por el +eparta%ento de transporte de la ;lorida >;+
4?! *sta %odificacin no ha sido so%etida a un estudio de cali&racin nacional y se &asa en el procedi%iento desarrollado y adoptado por ;+y no co%o co%o arteri arterias as princi principal pales? es?)) o pasa pasan n a tra#(s tra#(s de un terrenos accidentados accidentados >donde altas #elocidades #elocidades de operacin sería i%posi&le? se asignan a la Clase DD! Carreteras de Clase DD a %enudo sir#en #ia$es relati#a%ente cortos) el co%ieno o fin de #ia$es %ás largos o #ia$es de turis%o $uegan un papel i%portante! Clase DDD de carreteras de dos carriles :on carreteras "ue sir#en áreas %oderada%ente %oderada%ente desarrolladas! ueden ser tra%os de carreteras de dos carriles Clase D o Clase DD "ue pasan a tra#(s de las pe"ue3as ciudades o onas recreati#as desarrolladas! *n tales seg%entos) el tráfico local a %enudo se %ecla con el tráfico de paso) y la densidad de los puntos de acceso a la carretera no se%aforiados es nota&le%ente nota&le%ente %ayor "ue en una ona rural! Las carreteras Clase DDD ta%&i(n pueden ser seg%entos de tra%os %ás largos
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Highway Capacity Manual 2010
Two-lane Two-lane highways
Capítulo15
La definicin de las clases de carreteras de dos carriles se &asa en su funcin! 7ias arterias o carreteras troncales se consideran de Clase D) %ientras "ue la %ayoría de #ías colectoras y locales se consideran Clase DD o Clase DDD! La principal deter%inante de la clasificacin de una carretera es la e'pectati#a del %otorista) "ue podría no estar de acuerdo con la categoría funcional glo&al de la ruta! or e$e%plo) una carretera "ue co%u co%uni nica ca dos dos ciud ciudad ades es)) "ue "ue pasa pasa por por una una ona ona %ont %onta3 a3os osa a acci accide dent ntad ada a podr podría ía descri&irse co%o Clase DD) si los conductores la reconocen co%o una carretera donde no es facti&le alcanar alta #elocidad de&ido al terreno) la ruta podría toda#ía ser considerada en Clase D! Hasta autopistas de Clase DDD pueden incorporar tra%os de flu$o no interru%pidos de carreteras de dos carriles! HCM? Chapter 1E) Dntersecciones :e%aforiadas o el Capítulo 20) Dntersecciones controladas con se3ales de are o el Capítulo 21) rotondas! Los resultados de&en ser cuidadosa%ente considerados en con$unto con los de tra%os de flu$o interru%pido para o&tener un cuadro co%pleto de operaciones pro&a&le! Condiciones Básicas Las condiciones condiciones &ásicas &ásicas para las carreteras carreteras de dos carriles son la ausencia ausencia de restricci restricciones ones geo%(tric geo%(tricas) as) de tráfico) tráfico) o factores factores a%&ientales! a%&ientales! Las condiciones condiciones &ásicas &ásicas no son las %is%as condicione condiciones s típicas típicas o por defecto) defecto) aun"ue a%&as pueden refle$ar restriccion restricciones es co%unes! co%unes! Las condiciones &ásicas están %ás cerca de lo "ue puede considerarse co%o condiciones ideales >es decir) las %e$ores condiciones "ue pueden esperarse dado el dise3o y la operacin nor%al?! La %etodología de este capítulo corresponde a cuantificar los efectos de la geo%etría) factores de tráfico) tráfico) y a%&ientale a%&ientales s "ue son %ás restricti restricti#os #os "ue las condiciones condiciones &ásicas! &ásicas! Las condicione condiciones s &ásicas para carreteras de dos carriles son los siguientes • • • • • •
=ncho de carril %ayor o igual a 4)65 4)65 %) Fer%as %ás anchas o iguales a1)E %) =usencia de onas de no-re&ase) :olo #ehículos de pasa$eros en el flu$o de tráfico) Terreno plano y =usencia de i%pedi%entos i%pedi%entos al tráfico tráfico >se3ales de tránsito ) #ehículos cruando ?!
*l tráfico puede operar %uy &ien si los carriles y las &er%as son lo suficiente%ente a%plias co%o para no li%itar las #elocidades! Los carriles %ás estrechos "ue 4)65 %! y las &er%as %ás estrechas "ue 1)E0 % han %ostrado "ue reducen la #elocidad) y "ue ta%&i(n pueden au%entar el porcenta$e de de%oras por no re&ase >T:;?! La longitud y la frecuencia de onas de no re&ase son el resultado de la alineacin de la calada!
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Highway Capacity Manual 2010
Two-lane Two-lane highways
*'hi&it 15-1 *$e%plos de las tres clases de carreteras de dos carriles!
Capítulo15
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Highway Capacity Manual 2010
Two-lane Two-lane highways
Capítulo15
au%enta significati#a%ente el porcenta$e en el cual se for%an pelotones en el tránsito #ehicular ya "ue los conductores no pueden pasar #ehículos lentos en frente de ellos! Relaciones Básicas *l =ne'o 15-2 %uestra la relacin entre el flu$o) la #elocidad %edia de #ia$e >=T:?) y T:; >porcenta$e de de%oras por no re&ase? para un tra%o de carretera de dos carriles &a$o las condiciones &ásicas! +e&ido a "ue a%&as direcciones de flu$o interact,an en una carretera de dos carriles >por las %anio&ras de paso?) la %etodología de este capítulo analia cada direccin por separado! *l =ne'o 15-2 >&? ilustra una característica funda%ental "ue afecta las carreteras de dos carriles! Fa$os #ol,%enes direccionales generan altos #alores de orcenta$e de de%oras por no re&ase T:;! T:;! Con slo E00 #ehG h) el T:; oscila entre el 60) >con 200 #eh G h en el flu$o opuesto? a casi el E0 >con 1600 #eh G h en el flu$o opuesto?! *n %ulticarriles) flu$o ininterru%pido) por lo general #elocidades acepta&les han de %antenerse en proporciones relati#a%ente altas de capacidad! *n carreteras de dos carriles) la calidad del ser#icio >%edido por T:;? co%iena a deteriorarse a relati#a%ente &a$os flu$os de de%anda! CAPACIDAD Y NIVEE! DE !ERVICIO Ca"acidad La capacidad de una carretera de dos carriles en condiciones &ásicas es 1900 pc G h en una direcc direccin in)) con un lí%it lí%ite e de 4!200 4!200 pc G h para para el total de las dos direcc direccion iones! es! +e&ido +e&ido a las interacciones entre los flu$os direccionales) cuando se alcana una capacidad de 1900 pc G h en una direccin) el flu$o %á'i%o contrario sería li%itado a 1500 pc G h! Las condic condicion iones es de capaci capacidad dad rara%e rara%ente nte se pueden pueden o&ser# o&ser#ar ar)) e'cept e'cepto o en tra%os tra%os cortos cortos!! Considerando "ue la calidad del ser#icio se deteriora a relati#a%ente &a$os porcenta$es de flu$o) la %ayoría de las carreteras de dos carriles %e$oran de categoría antes de "ue la de%anda se acer"ue a la capacidad *l cálculo de la las condiciones condiciones de capacidad capacidad es i%portant i%portante e para la e#acuaci e#acuacin) n) planificac planificacin in de e#entos especiales) y la e#aluacin de los i%pactos por li&eracin de e%&otella%ientos! e%&otella%ientos! Caudal Caudales es &idire &idirecci cciona onales les de hasta hasta 4I00 4I00 #eh G h se pueden pueden o&ser#ar o&ser#ar en tra%os tra%os cortos cortos de carreteras) ali%entados por altas de%andas de uno o #arios carriles! *sto puede ocurrir en t,neles o puentes) por e$e%plo) pero tales tasas de flu$o no se pueden esperar en tra%os %ás largos! La capacidad no está definida para &icicletas en las carreteras de dos carriles por falta de datos! 7ol,%enes de &icicletas cercanos a la capacidad no ocurren a %enudo en carreteras dos carriles) e'cepto durante e#entos especiales para &icicletas) y h ay poca infor%acin disponi&le so&re la cual &asar una definicin!
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Highway Capacity Manual 2010
Two-lane Two-lane highways
Capítulo15
Ane#o 1$%& Velocidad%'l()o * PT!'+ Relaciones "or tra,o direccional -a)o condiciones -ásicas
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Highway Capacity Manual 2010
Two-lane Two-lane highways
Capítulo15
1! 7elocidad pro%edio de #ia$e >=T:? >=T:? refle$a la %o#ilidad en una carretera de dos carriles! :e define co%o la longitud del tra%o de carretera di#idido por el tie%po pro%edio de #ia$e "ue to%a a los #ehículos a atra#esarlo durante un inter#alo de tie%po de dise3o! 2! orcenta$e de +e%ora por no re&ase un #ehículo) >T:;? representa la li&ertad de %anio&ra) el confort y la con#eniencia del #ia$e! *s el porcenta$e pro%edio de tie%po "ue los #ehículos de&en #ia$ar en pelotones detrás de los #ehículos %ás lentos de&ido a la incapacidad de adelantar! +e&ido a "ue esta característica es difícil de %edir en el ca%po) una %edida sustituti#a es el porcenta$e de #ehículos "ue circulen a %enos de 4)0 segundos en un lugar representati#o en el seg%ento de la carretera! T:; ta%&i(n representa el porcenta$e apro'i%ado de los #ehículos "ue #ia$an en pelotn! 4! orcenta$e de la #elocidad de flu$o li&re >;;:? representa la capacidad de los #ehículos para #ia$ar en o cerca del lí%ite de #elocidad! *n carreteras Clase D de dos carriles) la #elocidad y la de%ora por restricciones de paso son a%&as i%portantes para los auto%o#ilistas! or lo tanto) en estas carreteras) el ni#el de ser#icio se define en t(r%inos de a%&as =T: y T:;! *n carreteras Clase DD) la #elocidad de desplaa%iento no es un te%a i%portante para los conductores! or lo tanto) en estas carreteras) el ni#el de ser#icio se define en t(r%inos de T:; T:; sola%ente! *n Clase DDD) DDD) no se espera altas #elocidades! +e&ido +e&ido a "ue a longitud longitud de tra%os tra%os clase DDD es general%e general%ente nte corta) las restricci restricciones ones de paso ta%poco son una preocupacin i%portante! *n estos casos) a los conductores les gustaría desplaarse a #elocidad constante o cerca del lí%ite de #elocidad! or lo tanto) en estas carreteras) se utilia el porcenta$e de #elocidad a flu$o li&re >;;:? para definir los ni#eles de ser#icio! Los criterios de ni#eles de ser#icio carreteras de dos carriles se %uestran en el cuadro cuadro 15-4! Ane#o 1$%/ Ni.eles de ser.icio "ara carreteras de dos carriles
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Highway Capacity Manual 2010
Two-lane Two-lane highways
Capítulo15
en un pelotn pelotn detrás de un #ehículo lento) ellos desearán realiar realiar %ás %anio&ras %anio&ras de adelanta%iento!
=%&as la capacidad de de adelanta%iento y la la de%anda de paso se relacionan relacionan con los porcenta$es porcenta$es de flu$o! :i el flu$o en a%&as direcciones au%enta) se esta&lece una tendencia difícil =sí co%o la de%anda de adelanta%iento au%enta) la capacidad de adelanta%iento dis%inuye *n @D7*L +* :*A7DCD< =) los conductores e'peri%entan altas #elocidades de operacin en carreteras Clase D y poca dificultad para adelantar! Las filas de tres o %ás #ehículos son escasos! *n Carreteras Clase DD) la #elocidad será controlada principal%ente por las condiciones de la carretera! :ería de esperar una pe"ue3a cantidad de filas de #ehículos! *n carreteras Clase DDD) los conductores de&en ser capaces de %antener #elocidades de operacin cerca o igual a la #elocidad de flu$o li&re >;;:? de la #ía! *n @D7* @D7*L L +* :*A7 :*A7DC DCD< D< F) La de%and de%anda a de adela adelanta nta%i %ient ento o y la capaci capacidad dad de paso paso están están e"uili&radas! *n carreteras de a%&as Clases D y DD) el grado de apelotona%iento se #uel#e notorio! =lgunas reducciones de #elocidad están presentes en carreteras de Clase D! *n carreteras de Clase DDD se hace difícil %antener la #elocidad de operacin pero la reduccin en la #elocidad es relati#a%ente pe"ue3a! *n @D7*L +* :*A7DCD< :*A7DCD< C) la %ayoría de los #ehículos están #ia$ando en filas! Las #elocidades se reducen nota&le%ente en las tres clases de carreteras! *n @D7*L +* :*A7DCD< +) Las filas #ehiculares au%entan significati#a%ente! La de%anda de paso es alta en a%&as clases de carreteras D y DD) pero la posi&ilidad de re&ase se apro'i%a a cero! 8n alto porcenta$e de #ehículos están #ia$ando en filas) filas) y T:; es &astante nota&le! nota&le! *n carreteras Clase) DDD la caída de ;;: es ahora significati#a! *n @D7*L +* :*A7DCD< *) la de%anda se está acercando a la capacidad! Ae&asar en carreteras Clase D y DD es práctica%ente i%posi&le) y el porcenta$e de de%ora siguiendo >T:;? es %ás del E0! Las #elocidades dis%inuyen se#era%ente! *n carreteras Clase DDD) la #elocidad es inferior a dos tercios de la #elocidad a flu$o li&re >;;:?! *l lí%ite inferior de estos @D7*L*: +* :*A7DCD< representa la capacidad! @D7*L +* :*A7DCD< ; e'iste sie%pre cuando el flu$o de de%anda en una o a%&as direcciones ede la acidad acidad del tra Las dicion dicion de in inesta inesta&le &le e'iste e'iste alt
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Highway Capacity Manual 2010
Two-lane Two-lane highways
Capítulo15
7elocidad de los #ehículos %otoriados) 7ol,%enes de #ehículos pesados) y *stado de la carpeta asfáltica! Los rangos de @D7*L +* :*A7DCD< para las &icicletas en las carreteras de dos carriles se dan en el ane'o 15-I! La %is%a puntuacin de ni#eles de ser#icio se utilia para carreteras %utlicarriles) co%o se descri&e in del Capítulo 1I! =ne'o 15-I @D7*L +* :*A7DCD< para &icicletas en carreteras de dos carriles
Datos de entrada re(eridos * .alores "redeter,inados "redeter,inados *l =ne'o 15-5 enu%era la infor%acin necesaria para aplicar la %etodología! Ta%&i(n contiene #alores #alores sugeridos sugeridos por defecto para su uso cuando cuando la infor%aci infor%acin n del tra%o tra%o específico específico no está disponi&le! :e ad#ierte al usuario) sin e%&argo) "ue cada uso de un #alor por defecto en lugar de una #aria&le %edida en ca%po del tra%o específico hace "ue los resultados del análisis sean %ás apro'i%ados y %enos relacionados con las condiciones específicas "ue descri&en el sitio de estudio! 7alores predeter%inados de&en usarse slo cuando las %ediciones de ca%po no pueden ser recogidas! *l uso de algunos #alores por defecto e s %enos pro&le%ático "ue otros! =nchos de carril y &er%as de 12 y 6 pies) respecti#a%ente) son co%unes) so&re todo en carreteras Clase D! :in e%&argo) estas #aria&les tienen grandes i%pactos en los ni#eles de ser#icio para &icicletas >@D7*L +* :*A7DCD) el au%ento de la i%portancia de los datos específicos del tra%o! 8na e#aluacin
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Highway Capacity Manual 2010
Two-lane Two-lane highways
Capítulo15
presencia de #ehículos pesados es ta%&i(n alta%ente apro'i%ada! *ste factor #aría a%plia%ente con las condiciones locales *l Capítulo 26) =utopistas y Tra%os de Carretera ade%ás) ofrecen #alores por defecto específicos para cada estado >I?! Co%o es el caso con todos los #alores por defecto) estos #alores de&en ser utiliados con cuidado) y slo cuando los datos específicos del sitio no pueden ser ad"uiridos por alg,n %oti#o raona&le! =ne'o 15-5 +atos de entrada re"ueridos y #alores por defecto para carreteras de dos carriles
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Highway Capacity Manual 2010
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Capítulo15
VOU0EN DE DE0ANDA Y 'U2O Los Los #ol,% #ol,%en enes es de de%a de%and nda a en gene genera rall está están n e'pr e'pres esad ados os en #ehí #ehícu culo los s por por hora hora en
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Highway Capacity Manual 2010
Two-lane Two-lane highways
Capítulo15
ACANCE DE A 0ETODOO3IA *n este este capí capítu tulo lo se pres presen enta ta una una %eto %etodo dolo logí gía a de anál anális isis is oper operac acio iona nall para para tra% tra%os os direccionales de carreteras de dos carriles para auto%#iles y ciclistas! =%&as direcciones puede ser analiada por separado en la carretera o tra%o para o&tener una esti%acin co%pleta de condiciones de funciona%iento! La %etodología para auto%otores de este capítulo a&orda el análisis de • • •
Tra%os direccionales en terreno general >plano u ondulado?) Tra%os direccionales en pendientes específicas) y Tra%os Tra%os direccional direccionales es incluyendo incluyendo carriles carriles de adelanta%ie adelanta%iento nto para #ehículos #ehículos pesados pesados en ascenso!
Todo Todo tra%o en terreno terreno %onta3oso) %onta3oso) y los "ue tengan %ás del 4 de pendiente pendiente o "ue tengan una una longi longitu tud d %ayo %ayorr a B90 B90 % >0)6 >0)60 0 %ill %illas as?? o %ás) %ás) de&e de&e ser ser anali analiad ado o co%o co%o pend pendien iente te específica! La %etodología es la %ás utiliada directa%ente para deter%inar los ni#eles de ser#icio >L<:? en un tra%o direccional unifor%e de carretera de dos carriles %ediante la esti%acin de las %edida %edidas s de eficac eficacia ia "ue define definen n los ni#ele ni#eles s de ser#ic ser#icio io #eloci #elocidad dad pro%ed pro%edio io de %archa %archa)) porcenta$e de de%oras por no re&ase y porcenta$e de #elocidad a flu$o li&re >=T:) T:;) ;;:?! *ste análisis ta%&i(n puede ser utiliado para deter%inar la capacidad del tra%o direccional o la tasa de flu$o de ser#icio "ue se puede aco%odar a cual"uier @D7*L +* :*A7DCD< dado!
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Highway Capacity Manual 2010 • • • • •
Two-lane Two-lane highways
Capítulo15
=ncho de la &er%a 0 a 1)E4 %! >0 to 6 ft? 7ol,%enes 7ol,%enes de #ehículos %otoriados hasta 46!000 tráfico pro%edio diario anual >==+T? 7elocidad 7elocidad Lí%ite I5 a 50 % G h orcenta$e de #ehículos pesados 0 a 2 y Condiciones del pa#i%ento 1 a 5 en la escala de calificacin de pa#i%ento de la ;HK=
La %etodología para deter%inar los @D7*L +* :*A7DCD< para &icicletas ta%poco considera diferencias en el co%porta%iento pre#alente del conductor) aun"ue el co%porta%iento del conductor puede #ariar considera&le%ente tanto a ni#el regional y por las características de la #ía! *n particular) la pro&a&ilidad de "ue los conductores &a$en la #elocidad o proporcionen espacio horiontal adicional al pasar ciclistas $uega un papel i%portante en la percepcin de calidad de ser#icio de una carretera!
0ODO AUTO0OTOR Re.isión *l =ne'o 15-6 ilustra los pasos &ásicos en la %etodología para carreteras de dos carriles! +e&ido a "ue las tres clases de carreteras utilian diferentes %edidas de ser#icio para deter%inar los @D7*L +* :*A7DCD<) no todos los pasos se aplican a cada clase de carretera! Tenga en cuenta "ue la etapa co%putacional del cálculo para la esti%acin de la #elocidad pro%edio =T: =T: se aplica slo a las carreteras clase D y Clase DDD ) %ientras "ue el paso para esti%ar el porcenta$e de de%oras por adelanta%iento >T:;? se aplica slo a carreteras clase D y DD ! *l paso para la esti%acin del porcenta$e de #elocidad a flu$o li&re >;;:? se aplica slo a la Clase DD D! TRA0O! PARA ANAI!I! La %etodología de este capítulo se aplica en tra%os de carreteras direccionales unifor%es de dos carril carriles! es! Mientra Mientras s "ue las dos direc direccio ciones nes de flu$o flu$o interac interact,a t,an n a tra#(s tra#(s de %anio& %anio&ras ras de paso paso >y li%itaciones en las %anio&ras de paso?) cada direccin de&e ser analiada por separado!
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Highway Capacity Manual 2010
Two-lane Two-lane highways
Capítulo15
:i el tra%o por analiar no se puede o&ser#ar directa%ente) entonces las %ediciones de un tra%o si%ilar si%ilar >la %is%a %is%a clase carretera) carretera) el %is%o lí%ite de #elocidad) #elocidad) a%&iente a%&iente si%ilar) si%ilar) etc!? puede ser utiliado! =ne'o 15-6 +iagra%a de flu$o de la %etodología ;lighway para carreteras de dos carriles
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Highway Capacity Manual 2010
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Capítulo15
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Highway Capacity Manual 2010
Two-lane Two-lane highways
Capítulo15
ara algunas carreteras) puede ser difícil o i%posi&le o&ser#ar %enos de 200 #eh G h ! *n tales casos) una %uestra de la #elocidad se puede to%ar con %ayores flu$os y a$ustarse! *l %is%o %(todo de %uestreo se to%a en cada direccin se o&ser#a por separado) con cada %uestra direccional "ue incluye al %enos 100 #elocidades o&ser#adas! La %ayor #elocidad %edida se a$usta con la *cuacin 15-1
*cuacin 15-1
+onde
;;:
S FM = ¿
7elocidad a flu$o li&re >%iGh? ro%edio de 7elocidad 7elocidad de la %uestra ># 200 #hGh? >%iGh? orcenta$e de flu$o de de%anda total)
a%&as direcciones) durante el período de
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Highway Capacity Manual 2010
Two-lane Two-lane highways
f LS
;actor de a$uste por ancho de &er%a &er%a >%ih?
f A
;actor de a$uste por densidad de puntos de acceso >%iGh?) y
Capítulo15
Cuan Cuando do se utili utilia an n las las %edi %edici cion ones es de ca%p ca%po o para para esti esti%a %arr la #elo #eloci cida dad d a flu$ flu$o o li&r li&re e ;;:) ;;:) las las apro'i%aciones y las t(cnicas de %uestreo de&en aplicarse! 4?! Los factores de a$uste para utiliar en la ecuacin 15-2 se encuentran en el =ne'o 15-9 >carril y ancho de &er%as? y =ne'o 15-E >densidad de puntos de acceso?!
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Highway Capacity Manual 2010
Two-lane Two-lane highways
Capítulo15
+onde
V i,ATS >pcGh? i #i
orcenta$e de flu$o de de%anda i para calcular la #elocidad %edia de recorrido =T: .dN .dN>a >aná nállisi isis en en la la di direcc recciin? n? .oN .oN >di >dire recc cciin opue opuest sta? a? 7olu%en de de%anda para la direccin i >#ehGh?
f ¿ ATS
;actor de grado de a$uste) del =ne'o 15-B or =ne'o 15-10 y
f HV , ATS
;actor de a$uste por #ehículos pesados de la ecuacin 15-I o 15-5!
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Highway Capacity Manual 2010
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Capítulo15
:i la de%anda se e'presa co%o un #olu%en horario) de&e di#idirse por la #ariacin en el flu$o #ehicular horario H; >7#ph 7 G H;? para o&tener el factor apropiado! Ta%&i(n a otras ta&las de factores de a$uste asociadas con la *cuacin 15-4 se entra con este #alor! Tenga en cuenta "ue el factor de a$uste para terreno plano es de 1)00) ya "ue el terreno es plano una de las condiciones de &ase! ara los fines de grado de a$uste) tra%os específicos de descenso se tratan co%o terreno plano! *l =ne'o 15-10 %uestra los factores de a$uste para pendientes específicas! *l i%pacto negati#o de los tra%os de ascenso en carreteras de dos carriles au%enta a %edida "ue la pendiente se hace %ás se#era y si la longitud del tra%o au%ento! *l i%pacto) sin e%&argo) dis%inuye a %edida au%enta el flu$o #ehicular! = %ayores flu$os) resulta #elocidades %as &a$as y el i%pacto adicional por pendiente de ascenso es %enos se#ero!
'actor de a)(ste de la .elocidad .elocidad "ro,edio 5AT!6 "or "resencia de .e7íc(los "esados Las condiciones ideales para las carreteras de dos carriles incluyen 100 de #ehículos li#ianos en la corriente de tráfico! *sta es una ocurrencia rara) y la presencia de #ehículos pesados en el flu$o de tráfico reduce el =T:! *n general) un #ehículo pesado se define co%o cual"uier #ehículo >o unidad de #ehículo con re%ol"ue? rodando so&re %ás de cuatro ruedas durante su funciona%iento nor%al! Los #ehículos pesados se clasifican co%o ca%iones o #ehículos recreati#os >A7s?! Los ca%iones cu&ren
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Highway Capacity Manual 2010
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Co%o se se3al anterior%ente) cual"uier pendiente de descenso de 4 o %ás de 1 % de longitud de&e ser analiada co%o pendiente específica! :i la pendiente de la pendiente #aría) se de&e analiar co%o un solo co%puesto utiliando un pro%edio calculado di#idiendo la ele#acin total por la longitud y e'presando el resultado co%o un porcenta$e! La %ayoría de descensos se tratan co%o terreno plano para propsitos de análisis! :in e%&argo) algunos descensos) son lo suficiente%ente gra#es co%o para o&ligar a algunos ca%iones a desplaarse
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=sí co%o en el caso con aso 4) este paso se aplica slo a carreteras de dos carriles Clase D y Clase DDD! Las de Clase DD no utilian la #elocidad pro%edio >=T:? co%o %edida de los ni#eles de ser#icio >L<:?! *l =T: se calcula a partir de la #elocidad a flu$o li&re >;;:?) la tasa de flu$o de de%anda) la tasa de flu$o opuesto) y el porcenta$e de onas de no re&ase en la direccin de análisis! *l =T: es calculado a partir de la *cuacin 15-6
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