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- 2015 (124) (entfernen)
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Zur Ermittlung einer Mehr- oder Minderbeanspruchung des Straßenoberbaus durch Lang-Lkw wurde eine Stichprobe von 1.746 Fahrten im Direktverkehr und 483 Fahrten im kombinierten Verkehr analysiert. Die durchschnittliche Fahrzeuggesamtmasse der Lang-Lkw betrug 32,3 t. Ca. 9 % der Lang-Lkw fuhren überladen. Das Niveau der Überladungen lag jeweils unterhalb 3 t. Die maximale Achslast betrug 11,7 t. Die Achslastverteilung von Lang-Lkw im kombinierten Verkehr weist ein niedrigeres Niveau als für Lang-Lkw im Direktverkehr auf. Im Vergleich zu äquivalenten konventionellen Lkw ergibt sich für Lang-Lkw eine um 5 % niedrigere Anzahl äquivalenter 10-t-Achsen. Der mittlere Achszahlfaktor fA von Lang-Lkw beträgt 7,40. Das Transportvolumen eines Lang-Lkw entspricht rechnerisch dem Transportvolumen von 1,53 äquivalenten konventionellen Lkw. Mit zunehmendem Anteil Lang-Lkw am Gesamtkollektiv Schwerverkehr (bis zu 9 %) ist eine zunehmende, vergleichsweise geringe Reduzierung der B-Zahl nach RStO 12 zu verzeichnen, was in der Regel jedoch nicht zu einem Wechsel in die nächstkleinere Belastungsklasse führen würde. Mittels Dimensionierung nach RDO Asphalt 09 errechnet sich bei Einsatz von Lang-Lkw nach dem Ende einer 30-jährigen Nutzungsdauer der Straßenbefestigung ein geringfügig niedrigerer Ermüdungsstatus, der zu einer marginalen Verlängerung des Nutzungszeitraums führen würde. Der Einsatz von Lang-Lkw würde unter Einhaltung der im Feldversuch definierten fahrzeugtechnischen Vorgaben und zulässigen Grenzwerte für Fahrzeuggesamtgewichte und Achslasten nicht zur Mehrbeanspruchung des Oberbaus von Straßen führen. Die rechnerisch festgestellte Minderbeanspruchung des Oberbaus im Vergleich zu konventionellen Lkw hat nur marginale Bedeutung und würde sich somit in der Praxis kaum spürbar auf die Nutzungsdauer der Straßen auswirken.
Die Festlegung der Salzdosierung (Streudichte) wird in der aktuellen Winterdienstpraxis zumeist vom Einsatzpersonal auf den Fahrzeugen vorgenommen. Aus der Auswertung von automatisierten Datenaufzeichnungen ist bekannt, dass dabei persönliche Erfahrungen eine wesentliche Rolle spielen. Das drückt sich darin aus, dass beim Vergleich des Dosierverhaltens von mehreren Mitarbeitern unter vergleichbaren Randbedingungen der durchschnittlich eingestellte Dosierwert bis zu 100 % abweicht. Das von der Bundesanstalt für Straßenwesen (Bergisch Gladbach, Deutschland) in Auftrag gegebene Pilotprojekt "Optimierung der Streustoffausbringung " Modell zur Festlegung der objektiv notwendigen Streudichten im Straßenwinterdienst" hatte die Minimierung von "subjektiven Faktoren" bei der Taustoffanwendung zum Ziel. Aufbauend auf dem Phasendiagramm für die Mischung von NaCl und H2O wurde ein Berechnungsalgorithmus entwickelt, der Temperatur und Wasserfilmdicke auf der Fahrbahn in wählbaren Prognosezeiträumen berücksichtigt. Die stündlich aktualisierten Prognosedaten werden während der Einsatzfahrt des Winterdienstfahrzeuges übermittelt und haben direkten Einfluss auf die Streudichte. Neben den Prognosedaten haben auch technologische und streckenbezogenen Randbedingungen direkten Einfluss auf die berechnete Streudichte. Technologische Randbedingungen sind die Streutechnologie (wahlweise FS 30 oder FS 100) und der Prognosezeitraum. Zu diesem Zweck wurden vier Fahrzeuge von Autobahnmeistereien in Brandenburg und Nordrhein-Westfalen mit Bordcomputern ausgestattet, mit denen Daten kurzfristiger Wetterprognosen des Deutschen Wetterdienstes (Zeithorizont: 3 Stunden), Messungen der Fahrbahntemperatur und Daten der an der Strecke befindlichen Straßenwetterstationen verarbeitet werden. Die Bordcomputer sind über das GSM-Netz mit einem zentralen Server verbunden. Dadurch werden die Daten der Wetterprognosen laufend aktualisiert. Der Einsatz der prognostischen Streudichteberechnung hat gezeigt, dass durch diese Technik erhebliche Einsparungspotenziale bei der Taustoffanwendung erschlossen werden können. Das gilt vor allem für präventive Streueinsätze.
Auf der planerischen Ebene hat sich die Vorgehensweise zur Berücksichtigung der artenschutzrechtlichen Vorschriften weitestgehend verfestigt und einen Stand erreicht, der eine rechtssichere Baurechtserlangung und eine darauf aufbauende Bautätigkeit erwarten lässt. Das Forschungsvorhaben beschränkt sich insofern auf die in den vorgelagerten Planungsebenen bisher nicht erkennbaren und damit planerisch auch nicht behandelten artenschutzrechtlichen Konflikte sowie auf die möglichen Konflikte im Zuge der straßenbaulicher Unterhaltung. Um vor dem Hintergrund der artenschutzrechtlichen Anforderungen für die Bauphase und die betriebliche Unterhaltung von Straßen eine ausreichende Rechtssicherheit zu gewährleisten, wurden im Zuge des Forschungsvorhabens Lösungsstrategien zur Vermeidung des Eintretens der Verbotstatbestände gemäß Paragraf 44 Absatz 1 Bundesnaturschutzgesetz (BNatSchG) und der Vermeidung eines Umweltschadens nach Paragraf 19 BNatSchG entwickelt. Aufbauend auf eine umfangreiche Analyse der einschlägigen Rechtsgrundlagen und Regelwerke sowie den Anforderungen zur Bewältigung der artenschutzrechtlichen Konflikte im Zuge der vorgelagerten Planungsebenen werden die in der Bau- und Betriebsphase verbleibenden Konflikte und Unsicherheiten eingegrenzt. Es werden Hinweise zur Vermeidung und Minimierung artenschutzrechtlicher Verbotstatbestände gegeben und Anforderungen an ggf. erforderliche Ausnahmegenehmigungen formuliert. Vertiefende rechtliche Fragestellung in Bezug auf die Berücksichtigung artenschutzrechtlicher Belange in der Bau- und Betriebsphase von Straßen sind Gegenstand eines extern beauftragten Gutachtens, welches dem Forschungsbericht als Anhang beigefügt ist.
During the past five years, a Euro NCAP technical working group on pedestrian safety has been working on improving test and assessment procedures for enhanced passive pedestrian safety. After harmonizing the tools and procedures as much as possible with legislation, the work was mainly focused on the development of grid procedures for the pedestrian body regions head, upper leg with pelvis and lower leg with knee. Furthermore, the test parameters for the head and the upper leg were revised, a new lower legform impactor was introduced and the injury thresholds were adjusted or, where necessary, the injury criteria were changed. Finally, the assessment limits and colour scheme were refined, widening the range and adding two more colours in order to provide a more detailed description of the pedestrian safety performance. By abstaining from an assessment based on a worst point selection philosophy, the improved test point determination procedures that were introduced during the years 2013 and 2014 give a more homogeneous, high resolution picture of the pedestrian safety performance of the vehicle frontends. By using a uniform grid for each test zone approximately 200 test points, evenly distributed within each area, can now be assessed per vehicle. The introduction of the flexible pedestrian legform impactor in 2014 enables a more realistic injury prediction of the knee and the tibia using a biofidelic test tool. With the new upper legform test that has been launched in 2015 the assessment in that area is now focusing on the injured body region instead of the injury causing vehicle part and thus is aligned with the approach in the remaining body regions head and lower leg. At the same time, a monitoring test with the headform impactor against the bonnet leading edge is closing the possible gap between the test areas to identify injury causing vehicle parts that moved out of focus due to the introduction of the new upper legform test. The paper describes the new test and assessment procedures with their underlying philosophy and gives an outlook in terms of open issues, specifying the needs for further improvement in the future. In parallel to the work of the pedestrian subgroup, a Euro NCAP working group on heavy vehicles introduced a set of protocol changes in 2011 that were related to the assessment of M1 vehicles derived from commercial vehicles, with a gross vehicle weight between 2.5 and 3.5 tons and 8 or 9 seats. The paper also investigates the applicability of the new pedestrian test and assessment procedures to heavy vehicles.
Ruptures and dissections of the thoracic and abdominal aortic vessel caused by traffic accidents are rare but potentially life-threatening injuries. They can occur by blunt trauma via seat belt or dashboard injury. The study aimed at evaluating the overall mortality, morbidity, neurological disorders, and differences in operative procedures of open repair and stenting. It shows that, with a change and improvement in diagnostic tools and surgical approach, mortality and morbidity of blunt aortic injuries were significantly reduced. Still an immediate life-threatening injury early diagnosis via multiple-slice and scans and surgical repair with minimally invasive stents showed excellent short-time results for selected patients.
Event data recorders (EDRs) are a valuable tool for in-depth investigation of traffic accidents. EDRs are installed on the airbag control module (ACM) to record vehicle and occupant information before, during, and after a crash event. This study evaluates EDR characteristics and aims at better understanding EDR performance for the improvement of accident reconstruction with more reliable and accurate information regarding accidents. The analysis is based on six crash tests with corresponding EDR datasets.
This study aimed at comparing head Wrap Around Distance (WAD) of Vulnerable Road User (VRU) obtained from the German in-depth Accident Database (GIDAS), the China in-depth Accident Database (CIDAS) and the Japanese in-depth Accident Database (ITARDA micro). Cumulative distribution of WAD of pedestrian and cyclist were obtained for each database (AIS2+) showing that WAD of cyclists were larger than the ones of pedestrians. Comparing three regions, the 50%tile WAD of GIDAS was larger than that of both Asian accident databases. Using linear regression that might predict WAD of pedestrians and cyclists from Impact speed and VRU height, WADs were calculated to be 206cm/219cm (Pedestrian/Cyclist) for GIDAS, 170cm/192cm for CIDAS and 211cm/235cm for ITARDA. In addition, this study may be helpful for reconsideration of WAD measurement alignment between accident reconstruction and test procedures.
The current paper reports on the results of a pilot study aiming to investigate the effect of mobile telephone use on the driving performance of 5 amateur and 5 professional drivers. Their driving acuity was tested through a driving simulator. Analysis and interpretation of the results occurred comparing the drivers' driving performance while talking, reading messages and writing a message on the mobile phone (intervention time) with the drivers' driving performance engaged in no activity (control time). The variables affected by the mobile phone were the "steering", the "lane offset" and the "duration of lane offset". Moreover, the drivers involved in a car crash in the last five years appeared to differ from those who were not involved in a crash in both "lane offset" and "following distance". The results of this pilot study will inform the design of a large experimental study on 50 professional and 50 amateur drivers.
Since a number of human models have been developed it appears sensible to use these models also in the accident analysis. Especially the understanding of injury mechanisms and probably even injury risk curves can be significantly improved when interesting accidents are reconstructed using human body models. However, an important limitation for utilising human models for accident reconstruction is the effort needed to develop detailed FE models of the accident partners or to prepare the human model reconstruction by running physical accident reconstructions. The proposed approach for using human models for accident reconstruction is to use simplified and parametric car models. These models can be adapted to the crash opponents in a fast and cost effective way. Although, accuracy is less compared to detailed FE models, the relevant change in velocity can be simulated well, indicating that the computation of a detailed crash pulse is not needed. Two frontal impact test accidents that were reconstructed experimentally and using the parametric car models are indicating sufficient correlation of the adapted parametric car models with the full scale crash reconstructions. However, further developments of the parametric models to be capable for the use in lateral impacts and rear impacts are needed. For the PC Crash simulation runs the output sampling rate is too large to allow sufficient analysis. In addition the performance appears to be too general.
Within the COST Action TU1101 the working group WG 1 is dealing with acceptance criteria and problems in helmet use while bicycling concerning conspicuity, thermal stress, ventilation deficits and other potential confounding. To analyze the helmet usage practice of bicyclists in Europe a questionnaire was developed in the scope of working group 1 to collect relevant information by means of a field study. The questionnaire consists of some 66 questions covering the fields of personal data of the cyclist, riding und helmet usage habits, information concerning the helmet model and the sensation of the helmet, as well as information on previous bicycle accidents. A second complementary study is conducted to analyze if the use of a bicycle helmet influences the seating geometry and the posture of cyclists when riding a bicycle and if the if the helmet vertically limits the vision. For this purpose cyclists with and without helmets were photographed in real world situations and relevant geometrical values such as the decline of the torso, the head posture of the upper vertical vision limit due to the helmet were established from the photos. The interim results of the field studies which were conducted in Germany by the Hannover Medical School are presented in this study. Some 227 questionnaires were filled out, of which 67 participants had used a helmet and 42 of the 227 participants have had a bicycle accident before. For the analysis of the riding position and posture of the cyclist over 40 pictures of riders with a helmet and over 240 pictures of riders without a helmet were measured concerning the seating geometry to describe the influence of using a bicycle helmet. Some results in summary: From the riders interviewed with the questionnaire only 11% of the city bike riders and 12% of the mountain bike riders always used the helmet, while 38% of the racing bike riders and 88% of the e-bike-riders always used the helmet. The helmet use seems not to change the sensation of safety of cycling compared to the use of a car. The arguments for not wearing a helmet are mostly stated to be the short distance of a trip, high temperatures or carelessness and waste of time. The reasons for using a helmet are stated to be the feeling of safety and being used to using a helmet. Being a role model for others was also stated to be a reason for helmet use. Concerning the sensation of the helmet 9% of the riders reported problems with the field of vision when using a helmet, 57% saw the problem of sweating too much, and 10% reported headaches or other unpleasant symptoms like pressure on the forehead when using the helmet. The analysis of the seating posture from the pictures taken of cyclists revealed that older cyclists generally have a riding position where the handle bar is higher than the seat (0-° to 10-° incline from seat to handlebar), while younger riders had a higher variance (between -10-° decline and 20-° incline). Further, elderly riders and riders with helmets seem to have a more upright position of the upper body when cycling. The vertical vision limit due to the helmet is determined by the front rim of the helmet (mostly the sun shade). Typical values here range from 0-° (horizontal line from the eye to the sun shade) to 75-° upwards, in which elderly riders tend to have a slightly higher vertical vision limit possibly due to the helmet being worn more towards the face.