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Institut
- Abteilung Fahrzeugtechnik (29) (entfernen)
Within this paper different European accident data sources were used to investigate the causations and backgrounds of road traffic accidents with pedestrians. Analyses of high level national data and in-depth accident data from Germany and Great Britain was used to confirm and refine preliminary accident scenarios identified from other sources using a literature review. General observations made included that a high proportion of killed or seriously injured pedestrian casualties impacted by cars were in "dark" light conditions. Seven accident scenarios were identified (each divided into "daylight" and "dark" light conditions) which included the majority of the car front-to-pedestrian crash configurations. Test scenarios were developed using the identified accident scenarios and relevant parameters. Hypothetical parameters were derived to describe the performance of pedestrian pre-crash systems based on the assumption that these systems are designed to avoid false positives as a very high priority, i.e. at virtually all costs. As result, three "Base Test Scenarios" were selected to be developed in detail in the AsPeCSS project. However, further Enhanced Test Scenarios may be needed to address environmental factors such as darkness if it is determined that system performance is sensitive to these factors. Finally, weighting factors for the accident scenarios for Europe (EU-27) were developed by averaging and extrapolation of the available data. This paper represents interim results of Work Package 1 within the AsPeCSS project.
Since integrated safety systems combine active and passive safety elements in one safety system, it is necessary to define new procedures to evaluate vehicle safety from the overall system point of view. The main goal of the ASSESS project is to develop harmonized and standardized assessment procedures for collision mitigation and avoidance systems. Methods and Data Sources: In ASSESS, procedures are developed for: driver behaviour evaluation, pre-crash system performance evaluation, crash performance evaluation, socio-economic assessment. This paper will concentrate on the activities related to the crash evaluation. The objective is to perform simulations, sled tests and crash tests in order tounderstand the influence of the activation of the pre-crash systems on the occupants" injuries during the crash phase. When a traffic accident is unavoidable, pre-crash systems work on various safety devices in order to improve the vehicle occupants" protection. Braking assistance and adaptive restraint systems are the main pre-crash systems whose effect on the occupants" protection will be described in this paper. Results: The results will be a description of the effect of the activation of the pre-crash systems on the crash phase. Additionally, a set of recommendations for future methodology developments will be delivered. Furthermore, a first approach to the study of the effect of the pre-crash systems activation on the occupants" protection when the impact is unavoidable will be presented. This effect will be quantified using the biomechanical values obtained from the simulation and testing activities and their related injury risks. Simulation and testing activities will consider the following scenarios: - No activation of any pre-crash system, - Activation of one or a combination of several pre-crash systems. In this way, differences in the results obtained from different scenarios will show the effect of each pre-crash system separately during the crash phase. Discussion and Limitations: The set of activities developed in this research project is limited by the fact that with the given resources only a limited number of vehicle models could be investigated. In addition, there are also limitations related to the injury risk curves and the passive safety tools currently on the market. Conclusion and Relevance to session submitted: The paper will present a complete analysis of the effect of pre-crash systems during the crash phase when the impact is unavoidable. Details, limitations and first application experience based on a few examples will be discussed. Currently, there is not any regulation, assessment program, or other similar official procedure able to assess pre-crash systems during the crash phase. This project comprises phases of traffic accidents which have been historically analysed separately, and aims to evaluate them taking into account their interrelationship. ASSESS is one of the first European projects which deals in depth with the concept of integrated safety, defining methodologies to analyse vehicle safety from a global point of view.
It is well known that most accidents with pedestrians are caused by the driver not being alert or misinterpreting the situation. For that reason advanced forward looking safety systems have a high potential to improve safety for this group of vulnerable road users. Active pedestrian protection systems combine reduction of impact speed by driver warning and/or autonomous braking with deployment of protective devices shortly before the imminent impact. According to the Euro NCAP roadmap the Autonomous Emergency Braking system tests for Pedestrians Protection will be set in force from 2016 onwards. Various projects and organisations in Europe are developing performance tests and assessment procedures as accompanying measures to the Euro NCAP initiative. To provide synthesised input to Euro NCAP so-called Harmonisation Platforms (HP-) have been established. Their main goal is to foster exchange of information on key subjects, thereby generating a clear overview of similarities and differences on the approaches chosen and, on that basis, recommend on future test procedures. In this paper activities of the Harmonisation Platform 2 on the development of Test Equipment are presented. For the testing targets that mimic humans different sensing technologies are required. A first set of specifications for pedestrian targets and the propulsion systems as collected by Harmonisation Platform 2 are presented together with a first evaluation for a number of available tools.
Aus wissenschaftlichen Untersuchungen ist bekannt, dass ältere Menschen trotz ihrer langen Fahrerfahrung in spezifischen Verkehrssituationen Fahrfehler und Unsicherheiten zeigen. In zwei Experimenten an jüngeren und älteren Versuchsteilnehmern wurde im Ergonomie-Labor der Bundesanstalt für Straßenwesen (BASt) versucht, den Ursachen spezifischer Fahrfehler älterer Kraftfahrer nachzugehen. Die Ergebnisse lieferten wichtige Ansatzpunkte für die Entwicklung von Fahrerassistenzsystemen (FAS), indem Erkenntnisse zu visuellen Aufmerksamkeitsleistungen gesammelt wurden. Im Rahmen eines Doppeltätigkeitsparadigmas wurde der visuell-räumliche Aufmerksamkeitsprozess, der für das Führen von Kraftfahrzeugen von wesentlicher Bedeutung ist, nicht nur auf der Verhaltensebene, sondern auch neurophysiologisch durch die Ableitung der Hirnströme mittels EEG untersucht. Hauptaufgabe war in beiden Experimenten eine Spurhalteaufgabe, die kurvenreiches Fahren simulieren sollte. Nebenaufgabe war jeweils eine Lichtreizaufgabe, bei der so schnell wie möglich durch Tastendruck auf einen Lichtreiz reagiert werden musste. Im zweiten Experiment wurde überprüft, ob bei der Lichtreizaufgabe die Verschlechterung der Aufmerksamkeitsleistung graduell erfolgt, indem bei den Lichtreizen die Exzentrizität erweitert wurde. Die Reize wurden bilateral, in abgestufter Form in verschiedenen Sehwinkeln von der Fovea centralis präsentiert. Dargestellt werden die Versuchsdurchführung sowie die Ergebnisse für die Verhaltensdaten und die festgestellten ereigniskorrelierten Potenziale (EKP). Es zeigte sich, dass durch die Berücksichtigung zusätzlicher weiterer Exzentrizitäten die Ergebnisse der Vorgängerstudie in bedeutsamer Weise erweitert werden konnten. Für beide Gruppen zeigten sich über den Verlauf hinweg klare Anzeichen für den Verlauf kompensatorischer Prozesse, die sich für die Älteren aber nur bis zu einem Sehwinkel von 50 Grad darstellten. Bei Reizen im Sehwinkel von 60 Grad war die Detektionsleistung deutlich schlechter, vor allem bei den älteren Versuchsteilnehmern. Außerdem wurde festgestellt, dass vor allem die Älteren Beeinträchtigungen in der Detektionsleistung zeigen, wenn der Abstand zwischen zwei Reizen gering ist. Es zeigt sich, das im Hinblick auf das Übersehen von Verkehrsobjekten, das eine wesentliche Ursache von Unfällen älterer Fahrer darstellt, diese technisch - beispielsweise bei Wende- oder Abbiegeprozessen - durch einen Sehfeldassistenten unterstützt werden können. Da Ältere durch schnelle Reaktionsabfolgen stärker beansprucht werden, sind Systeme mit Warnfunktion oder teilautomatisierte Systeme eher kritisch zu sehen, da sie zusätzlichen Bedien- beziehungsweise Überwachungsaufwand erfordern.
Aufgrund des demografischen Wandels werden in der Zukunft immer mehr ältere Menschen ein Kraftfahrzeug führen. Das vorliegende Projekt soll Erkenntnisse dazu liefern, wie unter Berücksichtigung der Verkehrssicherheit die Mobilität der älteren Fahrer so lange wie möglich erhalten werden kann. Unfallanalysen zeigen, dass ältere Kraftfahrer typische Fahrfehler bzw. Unfälle begehen. Unklar ist derzeit die genaue Ursache hierfür, vor allem vor dem Hintergrund der langjährigen Erfahrung älterer Kraftfahrer, welche eher eine äußerst geringe Unfallrate vermuten ließe. Ziel der vorliegenden Untersuchung war es, tiefere Erkenntnisse äber die Ursache von Fahrfehlern älterer Kraftfahrer zu gewinnen, um daraus Anforderungen an die technische Weiterentwicklung von Fahrerassistenzsystemen ableiten zu können. Diese Fahrerassistenzsysteme sollen speziell älteren Autofahrern Hilfestellung zum sicheren Führen von Kraftfahrzeugen bieten. In dem folgenden Laborexperiment wurde ein Doppeltätigkeits-Paradigma verwendet, indem eine Spurhalteaufgabe mit einer peripheren Lichtreizaufgabe kombiniert wurde. Die peripheren Lichtreize wurden den Probanden bilateral in zwei verschiedenen Abständen vom zentralen Punkt des Sehens (20 Grad und 60 Grad) präsentiert. Die Aufgaben wurden von älteren (65+) und jüngeren Kraftfahrern (22-45) zuerst einzeln, dann in Kombination durchgeführt. Um Aufschluss über mögliche Ursachen von Leistungsbeeinträchtigungen erhalten zu können, wurde neben der Erfassung von Verhaltensdaten (Spurabweichungen, Reaktionszeit, Anzahl der Auslassungen) ein Elektroenzephalogramm abgeleitet, welches Einblicke in die zugrunde liegenden neuronalen Verarbeitungsmechanismen ermöglicht. Wie erwartet, zeigten Ältere in der Spurhalteaufgabe schlechtere Leistungen als Jüngere, besonders bei gleichzeitiger Durchführung der Lichtreizaufgabe (Doppel-Aufgabe). In der Lichtreizaufgabe unterschieden sich die Leistungen der Altersgruppen nur bei Lichtreizen, die im 60 Grad Sehwinkel auftraten. Die Älteren reagierten hier langsamer und zeigten mehr Auslassungen als die Jüngeren. Überraschenderweise zeigten alle Versuchspersonen weniger Auslassungen in der Doppel-Aufgabe. Mittels Elektroenzephalogramm wurde anhand der ereigniskorrelierten Potenziale (EKP) deutlich, dass die Defizite Älterer nicht in einer Einschränkung der frühen Verarbeitung peripherer Reize (P1) liegen, da die P1 Amplitude bei Älteren sogar höher war als bei Jüngeren. Die N2 Amplitude, welche Hinweise auf die Verschiebung der Aufmerksamkeit gibt, war bei Jüngeren hingegen bei weiter peripher liegenden Reizen (60 Grad Sehwinkel) erhöht, was einen fronto-zentral fokussierten Kontrollprozess widerspiegelt. Die Orientierung auf den peripheren Reiz (P3a) war bei Älteren geringer ausgeprägt sowie auch die Zuordnung von Verarbeitungsressourcen (P3b) vor allem bei peripheren Lichtreizen. Es liegen zudem Hinweise darauf vor, dass Ältere verlängerte Reaktionszeiten aufgrund einer verzögerten Reaktionsaktivierung aufweisen. Mit dem vorliegenden Experiment konnte also gezeigt werden, dass die schlechteren Leistungen der älteren Versuchspersonen nicht auf periphere Sehleistungsmängel zurückzuführen sind, sondern einem späteren kognitiven Verarbeitungsprozess zuzuschreiben sind. Die Ergebnisse werden vor dem Hintergrund der Literatur und der Erfordernisse technischer Unterstützungen älterer Kraftfahrer diskutiert.
Although the bus belongs to the safest traffic means, single accidents can be particularly severe and concern many passengers. Especially in case of fires a high number of injured and killed persons can be the outcome. Fire safety of buses therefore is of high importance. With the increase of synthetic and plastic materials as a material for the interior equipment of buses and coaches because of their ood mechanical properties combined with low weight, the question arises whether the safety level has decreased in case of a fire during the last years - also compared to other means of transport. Because of the combustible plastics and their ability to release a high amount of heat the main fire load in buses is no longer the fuel but the plastic materials which are also often easy to ignite. Besides the flammability of the equipments, the production of smoke, the smoke development and propagation and its toxicity for the people as well as the testing methods and limit values are of interest. For those reasons research projects were initiated on behalf of the German Federal Highway Research Institute. At the one hand the fire behavior of coach interiors was examined in general focusing on fire propagation as well as fire detection and signalling. As result, recommendations with regard to early fire detection systems for the engine compartments and on-board extinguishing equipment were elaborated. At the other hand research is carried out to examine heat release, smoke, smoke propagation and its toxicity due to burning bus interior materials. The paper describes which effective and economically reasonable fire safety requirements for interiors of buses would improve the current situation. Proposals for amendments of current requirements are recommended including the specification of appropriate limit values. In particular, it is taken into consideration which reasonable fire safety standards from other transport sectors, especially the rail sector, should be transferred to buses.
Economic constraints nowadays require transporting greater volumes of freight at lower cost. Yet, physical profiles of trucks do not all generate the same effects on road infrastructure for a given tonnage hauled. The objective then lies in finding an optimal service level that reduces the damage caused to infrastructure. Results derived for the impact of trucks on pavements are presented. The impact of truck traffic trends on road bridges will also be discussed.rn
Recent accident statistics from the German national database state bicyclists being the second endangered group of vulnerable road users besides pedestrians. With 399 fatalities, more than 14.000 seriously injured and more than 61.000 slightly injured persons on german roads in the year 2011, the group of bicyclists is ranked second of all road user groups (Statistisches Bundesamt, 2012). While the overall bicycle helmet usage frequency in Germany is very low, evidence is given that its usage leads to a significant reduction of severe head injuries. After an estimation of the benefit of bicycle helmet usage as well as an appropriate test procedure for bicyclists, this paper describes two different approaches for the improvement of bicyclist safety. While the first one is focusing on the assessment of the vehicle based protection potential for bicyclists, the second one is concentrating on the safety assessment of bicycle helmets. Within the first part of the study the possible revision of the existing pedestrian testing protocols is being examined, using in depth accident data, full scale simulation and hardware testing. Within the second part of the study, the results of tests according to supplemental test procedures for the safety assessment of bicycle helmets developed by the German Federal Highway Research Institute (BASt) are presented. An additional full scale test performed at reduced impact speed proves that measures of active vehicle safety as e.g. braking before the collision event do not necessarily always lead to a reduction of injury severity.
The main objective of EC CASPER research project is to reduce fatalities and injuries of children travelling in cars. Accidents involving children were investigated, modelling of human being and tools for dummies were advanced, a survey for the diagnosis of child safety was carried out and demands and applications were analysed. From the many research tasks of the CASPER project, the intention of this paper is to address the following: • In-depth investigation of accidents and accident reconstruction. These will provide important points for the injury risk curve, in order to improve it. Different accident investigation teams collected data from real road accidents, involving child car passengers, in five different European countries. Then, a selection of the most appropriate cases for the injury risk curve and the purposes of the project was made for an in-depth analysis. The final stage of this analysis was to conduct an accident reconstruction to validate the results obtained. The in-depth analysis included on-scene accident investigation, creating virtual simulations of the accident/possible reconstruction, and conducting the reconstruction. In the cases of successful reconstructions, new points were introduced to the injury risk curves. Accident reconstructions of selected cases were carried out in test laboratories as the next step following in-depth road accident investigation. These cases were reconstructed using similar child restraint systems (CRS) and the same type make and model as in the real accidents. Reconstructing real cases has several limitations, such as crash angle, cars" approximation paths and crash speed. However, a few changes and applications on the testing conditions were applied to reduce the limitations and improved the representations of the real accidents. After conducting the reconstructions, a comparison between the deformations of the cars on the real accident and the vehicles from the reconstructions was made. Additionally, a correlation between the data captured from the dummies and the injury data from the real accident was sought. This finalises an in-depth analysis of the accident, which will provide new relevant points to the injury risk curve. The CASPER project conducted a large research programme on child safety. On technical points, a promising research area is the developing injury risk curves as a result of in-depth accident investigations and reconstructions. This abstract was written whilst the project was not yet finished and final results are not yet known, but they will be available by the time of the conference. All the works and findings will not necessarily be integrated in the industrial versions of evaluation tools as the CASPER project is a research program.
Verschiedene Forschungsprojekte aus dem Bereich Kooperativer Systeme, die vor Kurzem gestartet sind, beschäftigen sich unter anderem mit den organisatorischen Aspekten einer Gesamtarchitektur. Eine Organisationsarchitektur beschreibt dabei die Rollen und Verantwortlichkeiten, die im Betrieb unterschiedlicher Kooperativer Anwendungen auftreten. In den Projekten erfolgt zumeist eine Betrachtung der Organisationsarchitektur anhand konkreter Implementierungsszenarien oder Use Cases. Der im Bericht dokumentierte aktuelle Stand der abstrakten Beschreibung der Rollen und Verantwortlichkeiten soll den Projekten und Initiativen als Diskussionsgrundlage und Ausgangspunkt für die Erarbeitung einer möglichen Organisationsarchitektur Kooperativer Systeme und deren Ausgestaltung dienen.