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APUNTES DE SEGURIDAD VIAL
Expositor: Francisco Justo SIERRA
Ingeniero Civil - UBA
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Apuntes de Seguridad Vial
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Apuntes de Seguridad Vial
Las medidas de SV nacieron como respuesta a los accidentes de tránsito (reactivas).
Prueba / Error → Conocimiento
Se racionalizaron las experiencias y se idearon medidas de prevención (proactivas).
Nunca una sola medida provee una solución total a un problema de seguridad.
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Apuntes de Seguridad Vial
Más vale prevenir que curar
Los choques ocurren cuando algo anda mal.
A ningún o muy bajo costo, muchos choques pueden evitarse.
Formar expertos en todos los temas de la SV
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Apuntes de Seguridad Vial
ESTRATEGIA: Qué hacer, por qué,
cuánto, cuándo y dónde.
Objetivo último: minimizar choques,
salvar vidas, evitar heridos, reducir
daños.
Aunque la necesidad y objetivos de la
SV parecen obvios, el desafío es
enorme.
Clave: Conciencia SV = f($); 3% PBI
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Apuntes de Seguridad Vial
TÁCTICA: Cómo hacer
Conocimiento + buenas herramientas +
entrenamiento práctico AASHTO: Roadside Design Guide, Yellow Book, Plan
Estratégico, manual de AASHTO (en marcha).
FHWA: IHSDM
Evitar experimentos riesgosos; aprovechar
experiencia ajena, biblioteca virtual
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Apuntes de Seguridad Vial
LOGÍSTICA: Con qué hacer
Todos los actores actuando
concertadamente sobre todas las
causas, con todos los medios aptos
Institucionalización de la SV: Ley de
SV, Consejo Nacional de SV Organismos Viales, de Educación, Policía,
Bomberos, Salud Pública, Economía, Servicios
Médicos de Urgencia, Alcaldías, ONG
Las 3E+2E del inglés.
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Apuntes de Seguridad Vial
Conocer cómo, cuándo, dónde y por qué ocurrieron los accidentes es la base de un amplio programa de SV.
Datos: inventario, censos de volumen y velocidad, registro de accidentes.
Analizar los datos antes-y-después de las medidas, para confirmar las eficientes.
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Apuntes de Seguridad Vial
Hay muchas prácticas y técnicas efectivas de bajo costo, para aplicar tan rápido como fuere posible.
El profesional vial debe procurar estar al tanto del avance del conocimiento en SV.
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Apuntes de Seguridad Vial
Hay quienes diseñan según valores mínimos, usando un enfoque de recetario-de-cocina e ignorando los costos en muertos, heridos y daños materiales.
Un camino diseñado según una serie de normas no necesariamente será seguro.
El camino totalmente seguro es un mito. Ezra Hauer
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Apuntes de Seguridad Vial
El sentido común puede ser un pésimo
consejero para tomar decisiones que
conduzcan a menores riesgos. Ejemplo de bolsas de aire y conducción agresiva
Anchos y velocidad
(TEORÍA DE LA HOMEOSTASIS DEL RIESGO, O TIRO POR LA CULATA)
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Apuntes de Seguridad Vial
Hoy, el enfoque para la SV es: 1) Mantener el vehículo en el camino,
2) remover, modificar, o proteger los peligros a los costados del camino, CDC, y
3) minimizar los daños a los pasajeros de vehículos que choquen contra peligros a los CDC.
Cada uno de estos objetivos requiere considerar los tres componentes del problema: CVC
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Humanos -
Factores de
Riesgo
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Modos de Conducción
“Socialmente Patológicos”
Consumo de alcohol y drogas
Falta de descanso
No uso del cinturón de seguridad y bolsas
Documentación habilitante vencida
Pobre mantenimiento del vehículo
Asunción de riesgos – paradoja homeostasis
Falta prevención y de autocrítica
Pasión por la alta velocidad, agresividad
Minusvalía de la vida propia y ajena
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Vehículos -
Factores de
Riesgo
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Camino - Factores de Riesgo
EN CALZADA (falta o existencia)
Señalización y marcación
Fricción, pav. antideslizante
Drenaje agua lluvia, baches
Exudación asfalto
Franjas sonoras eje y borde
Visibilidad H y V
Intersecciones a nivel
Iluminación
Cruce ferroviario a nivel
Cruce animales a nivel
FUERA CALZADA (existencia)
Bermas de tierra suelta
Caída borde pavimento
Árboles
Taludes ≥ 1:3
Cunetas perfil no atravesable
Postes señalización
Servicios públicos
Cabeceras, muros
Pilas, estribos
Barandas y barreras
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Peligros en el camino
• Zonas de trabajo
• Empalmes
• Objetos extraños
• Caída de borde de pavimento
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Hidroplaneo
Choques en
la calzada
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Falta de visibilidad vertical
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Falta de visibilidad horizontal
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Alineamientos incoherentes
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Intersección a nivel en “autopista”
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Cruces peatonales
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Desvíos desde la calzada, DDC
Zona despejada, indulgente
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Contramedidas eficientes:
franja sonora y zona despejada
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Riesgo Bajo
Accidentes SDC:
daños al vehículo,
heridas y golpes
a los ocupantes
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Riesgo Moderado
Riesgo Alto
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Riesgo Muy Alto
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41 Caída borde de pavimento, CBP
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Cunetas revestidas
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Combinación cuneta,
baranda y traslapo 1
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Talud >
1:3
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Cámaras, tapas y sumideros
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Alcantarillas
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Tratamiento de Alcantarilla en Talud
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68 Tratamiento de Alcantarilla en Talud
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¿?
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Árboles, ecología y seguridad vial
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Doble mensaje
visual
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Accidente más frecuente por SDC
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Árbol
Poste
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Más postes
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Tributo póstumo
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Bases de postes
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Rocas
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Obras de mampostería
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Obras de hormigón
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Barandas de puente
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Barandas
de Puente
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Discontinuidad
geométrica y estructural
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Continuidad geométrica y
estructural
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Prototipo baranda de puente
General Motors 1961
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Vuelco por Choque Contra
Pequeña Estructura
Cordón Vereda
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Solución deseable
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Otra solución
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Preferible sin baranda
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Extremos de baranda
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Extremo “arpón”
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Extremo “abrelatas”
o “cola de pescado”
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Extremo recomendado
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Buenos Tratamientos de los Extremos de Aproximación de las Barandas Flexibles
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Extremo enterrado
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Traslapo invertido 2
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Traslapo invertido 3
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Baranda muy baja
NCHRP 350
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Montaje muy alto
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Control
altura
baranda
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Muy pocos postes
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Baranda muy corta
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Claro corto
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Claros cortos
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Faltan bulones
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Elementos enganchadores
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Perfiles de Formas Seguras de Hormigón Barrera de mediana para vehículos
pesados Autopista Nueva Jersey
Barrera Texas de pendiente constante
Barreras Rígidas de Hormigón
GM NJ PF
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Barrera de hormigón de 2.3 m para
contener y redirigir vehículo de 36 t
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Accidentes y Velocidad
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BMW debajo camión, 1 muerto
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Lo malo sería que empataran…
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…por ganarle al
rojo…
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…como estos dos
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Servicios rurales de emergencia médica
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Cruces ferroviarios a nivel
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Veredas
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Guías y
Seguridad
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¿Preguntas…?