{"id":618,"date":"2015-03-17T21:34:28","date_gmt":"2015-03-17T20:34:28","guid":{"rendered":"http:\/\/reconstruccionaccidentestrafico.com\/?p=618"},"modified":"2024-08-27T10:49:13","modified_gmt":"2024-08-27T08:49:13","slug":"investigacio-reconstruccio-daccidents-de-transit-les-mal-anomenades-caixes-negres-que-es-el-cdr-el-edr","status":"publish","type":"post","link":"https:\/\/reconstruccionaccidentestrafico.com\/ca\/investigacio-reconstruccio-daccidents-de-transit-les-mal-anomenades-caixes-negres-que-es-el-cdr-el-edr\/","title":{"rendered":"Investigaci\u00f3 i reconstrucci\u00f3 d&#8217;accidents de tr\u00e0nsit: Les mal anomenades caixes negres, Qu\u00e8 \u00e9s el CDR i el EDR?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"618\" class=\"elementor elementor-618 elementor-613\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-a20f703 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a20f703\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-a8b0e76\" data-id=\"a8b0e76\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3f1a146 elementor-widget elementor-widget-heading\" data-id=\"3f1a146\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Signigicat del acr\u00f2nim CDR<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-41398680 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"41398680\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-47b5e1eb\" data-id=\"47b5e1eb\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6c428212 elementor-widget elementor-widget-text-editor\" data-id=\"6c428212\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif; font-size: var( --e-global-typography-text-font-size ); font-weight: var( --e-global-typography-text-font-weight );\">Apareix a Espanya una nova i molt potent eina per als perits en la investigaci\u00f3 i reconstrucci\u00f3 d&#8217;accidents de tr\u00e0nsit, el CDR. CDR \u00e9s l&#8217;acr\u00f2nim de &#8220;Crash Data Retrieval&#8221;, que s&#8217;utilitza per descriure l&#8217;eina CDR; i EDR \u00e9s l&#8217;acr\u00f2nim de &#8220;Event Data Recorder&#8221;, que \u00e9s una funci\u00f3 o dispositiu instal\u00b7lat al m\u00f2dul de control de airbag (ACM). L&#8217;eina CDR \u00e9s un sistema compost per un hardware i un software que permet l&#8217;acc\u00e9s a la informaci\u00f3 que queda registrada despr\u00e9s d&#8217;una col\u00b7lisi\u00f3 dins del m\u00f2dul del airbag (ACM) o un altre m\u00f2dul, com passa en FORD, que tamb\u00e9 utilitza el m\u00f2dul del sistema de transmissi\u00f3 del motor (PCM). Actualment l&#8217;\u00fas d&#8217;aquesta eina est\u00e0 plenament est\u00e8s als EUA sent usada per forces de l&#8217;ordre, perits reconstructors, els gestors de flotes i investigadors del govern per tenir acc\u00e9s a aquesta informaci\u00f3. No ha estat fins ara quan l&#8217;\u00fas d&#8217;aquesta eina ha arribat a Europa per mediaci\u00f3 dels cossos policials a Anglaterra. La porta d&#8217;entrada a Espanya ha estat a trav\u00e9s de Mossos d&#8217;Esquadra, que han estat formats com a t\u00e8cnics i analistes en CDR, essent pioners a nivell nacional en l&#8217;\u00fas d&#8217;aquesta tecnologia.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-fcdb81d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"fcdb81d\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-b2183df\" data-id=\"b2183df\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-03da8ad elementor-widget elementor-widget-heading\" data-id=\"03da8ad\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Per qu\u00e8 no \u00e9s del tot correcte el terme \"caixa negra\"?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-4d0a0d0 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"4d0a0d0\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-e795934\" data-id=\"e795934\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-f1d258a elementor-widget elementor-widget-text-editor\" data-id=\"f1d258a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif; font-size: var( --e-global-typography-text-font-size ); font-weight: var( --e-global-typography-text-font-weight );\">La capacitat del m\u00f2dul del control de l&#8217;airbag per guardar les dades despr\u00e9s d&#8217;una col\u00b7lisi\u00f3 ha portat a alguns a referir-se err\u00f2niament a aquest sistema com a &#8220;caixa negra&#8221;. En realitat no \u00e9s cap sistema independent que estigui destinat exclusivament a registrar dades en cas d&#8217;accident, sin\u00f3 que \u00e9s un sistema o dispositiu dins del m\u00f2dul de control de l&#8217;airbag, que recull i registra informaci\u00f3 necess\u00e0ria per al correcte funcionament de dispositius, com pot ser el airbag o els pretensors dels cinturons. L&#8217;ACM utilitza els sistemes de detecci\u00f3 de col\u00b7lisi\u00f3, sensors de cintur\u00f3 de seguretat i els sistemes de detecci\u00f3 de pres\u00e8ncia, per decidir si s&#8217;activen o no, i quan, els coixins de seguretat i altres dispositius del sistema de retenci\u00f3. Quan es compleixen certes condicions, el m\u00f2dul de control de l&#8217;airbag registra les dades associades a aquests canvis bruscos en l&#8217;acceleraci\u00f3, la direcci\u00f3 o rotaci\u00f3 (\u00e9s a dir, una col\u00b7lisi\u00f3). Aquesta informaci\u00f3, en cas de col\u00b7lisi\u00f3, queda registrada i pot ser extreta a trav\u00e9s del CDR, interpretada i utilitzada per a la investigaci\u00f3 de les causes del sinistre. \u00c9s una informaci\u00f3 de la qual ja es disposava dins dels diferents m\u00f2duls del vehicle, per\u00f2 que ara podem extreure i utilitzar per a la investigaci\u00f3 i reconstrucci\u00f3 d&#8217;accidents de tr\u00e0nsit.\u00a0<\/span><\/p><p>\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-259a105 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"259a105\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-bf70cb4\" data-id=\"bf70cb4\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-767bc15 elementor-widget elementor-widget-heading\" data-id=\"767bc15\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Com pot ajudar-nos el CDR en la reconstrucci\u00f3 d'un accident de tr\u00e0nsit?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e839739 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e839739\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-6c5b8d1\" data-id=\"6c5b8d1\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a0dfc05 elementor-widget elementor-widget-text-editor\" data-id=\"a0dfc05\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>El sistema de CDR ens pot ajudar en els seg\u00fcents aspectes:<\/p><p>&#8211; L&#8217;obtenci\u00f3 de les dades precol\u00b7lisi\u00f3 i de col\u00b7lisi\u00f3 dels vehicles.<\/p><p>&#8211; L&#8217;obtenci\u00f3 de les dades de la intensitat de col\u00b7lisi\u00f3 (DeltaV).<\/p><p>&#8211; Avaluar de manera m\u00e9s precisa i detallada l&#8217;an\u00e0lisi de velocitat i intensitat de la col\u00b7lisi\u00f3.<\/p><p>&#8211; Proporcionar dades m\u00e9s precises per a la reconstrucci\u00f3 de l&#8217;accident.<\/p><p>&#8211; Determinar si certes situacions de col\u00b7lisi\u00f3 s\u00f3n possibles.<\/p><p>&#8211; Detecci\u00f3 de fraus.<\/p><p>El 2005 el 64% de la producci\u00f3 de cotxes als EUA estava prove\u00efda d&#8217;EDR i el 2013 la instal\u00b7laci\u00f3 de EDR pass\u00e0 a ser obligat\u00f2ria en tots els cotxes (americans, europeus, asi\u00e0tics) venuts als EUA i Canad\u00e0.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-f9544e7 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"f9544e7\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-bc6b836\" data-id=\"bc6b836\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b019e57 elementor-widget elementor-widget-heading\" data-id=\"b019e57\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Panorama a Europa<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6b96697 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6b96697\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-53e5106\" data-id=\"53e5106\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4a9831b elementor-widget elementor-widget-text-editor\" data-id=\"4a9831b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>A nivell del Parlament Europeu hi ha l&#8217;informe &#8220;European road safety 2011-2020&#8221; que demana a la Comissi\u00f3 que presenti una proposta legislativa, amb un calendari i un procediment d&#8217;aprovaci\u00f3 detallat a finals de 2012, que preveu la introducci\u00f3 gradual, en un principi a vehicles de lloguer i posteriorment tamb\u00e9 en vehicles comercials i particulars, d&#8217;un sistema de registre d&#8217;accidents integrat amb una lectura estandarditzada que registri les dades rellevants abans, durant i despr\u00e9s dels accidents (&#8220;Event Data Recording&#8221;). La introducci\u00f3 del sistema a Europa per part de les marques est\u00e0 sent gradual. Per exemple, Volvo va activar el sistema a Europa a principis del 2014 i altres fabricant com Toyota ho van fer a mitjans del 2014.<\/p><p>Origin\u00e0riament aquest dispositiu el fabricava Vetronix i ara el dissenya i fabrica Bosch USA. Inicialment nom\u00e9s el sistema Bosch CDR tool estava disponible al mercat per poder llegir la informaci\u00f3 de l&#8217;EDR, si b\u00e9 actualment hi ha diverses eines de diferents fabricants que permeten llegir la informaci\u00f3 de l&#8217;EDR. Una daquestes eines \u00e9s Crash Scan de Collision Science, d&#8217;utilitzaci\u00f3 molt m\u00e9s senzilla i econ\u00f2mica. A m\u00e9s, Crash Scan permet el bolcat directe de les dades al programari de Reconstrucci\u00f3 d&#8217;accidents A<a href=\"https:\/\/reconstruccionaccidentestrafico.com\/distribucion-de-software-de-reconstruccion\/\" target=\"_blank\" rel=\"noopener\">nalyzerPro<\/a>\u00a0per integrar-los al nostre projecte.<\/p><p>\u00a0<\/p><p>El futur en la investigaci\u00f3 i la reconstrucci\u00f3 d&#8217;accidents de tr\u00e0nsit passa pel sistema CDR.<\/p><p>\u00a0<\/p><p>Jordi Rivera Garcia<\/p><p>\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-13813ab elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"13813ab\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-598f6f0\" data-id=\"598f6f0\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-54e4c7c elementor-widget elementor-widget-video\" data-id=\"54e4c7c\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/youtu.be\\\/NIbxGf7IPWw?si=JuIXhT-BWzJXkuha&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-439c1c6 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"439c1c6\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-0eabff8\" data-id=\"0eabff8\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9d8b530 elementor-widget elementor-widget-video\" data-id=\"9d8b530\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/youtu.be\\\/a3RVEDwqKuU?si=huxjCVIwefU77It6&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Signigicat del acr\u00f2nim CDR Apareix a Espanya una nova i molt potent eina per als perits en la investigaci\u00f3 i reconstrucci\u00f3 d&#8217;accidents de tr\u00e0nsit, el CDR. CDR \u00e9s l&#8217;acr\u00f2nim de &#8220;Crash Data Retrieval&#8221;, que s&#8217;utilitza per descriure l&#8217;eina CDR; i EDR \u00e9s l&#8217;acr\u00f2nim de &#8220;Event Data Recorder&#8221;, que \u00e9s una funci\u00f3 o dispositiu instal\u00b7lat al [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":615,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"_joinchat":[],"footnotes":""},"categories":[1],"tags":[],"class_list":["post-618","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-noticies"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u25b7Investigaci\u00f3 i reconstrucci\u00f3 d&#039;accidents de tr\u00e0nsit: Les mal anomenades caixes negres, Qu\u00e8 \u00e9s el CDR i el EDR? - \u3010 Perito de Accidentes de Tr\u00e1fico en Barcelona | Investigaci\u00f3n y Reconstrucci\u00f3n \u3011<\/title>\n<meta name=\"description\" content=\"Investigaci\u00f3 i reconstrucci\u00f3 d&#039;accidents de tr\u00e0nsit: Les mal anomenades caixes negres, Qu\u00e8 \u00e9s el CDR i el EDR?\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/reconstruccionaccidentestrafico.com\/ca\/investigacio-reconstruccio-daccidents-de-transit-les-mal-anomenades-caixes-negres-que-es-el-cdr-el-edr\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u25b7Investigaci\u00f3 i reconstrucci\u00f3 d&#039;accidents de tr\u00e0nsit: Les mal anomenades caixes negres, Qu\u00e8 \u00e9s el CDR i el EDR? 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