MoToRcyclE RoAD SAFETy REpoRT 2010 - Dekra

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Road accidents and vehicle defects1Example 3TECHNICAL DEFECT IN THE TYRE VALVE2Sequence of events leading up to the accident:A motorcycle with two occupants was travellingalong a main road when it toppled over. Themotorcyclist was flung under the safety barrierand the passenger lay on the ground close to themotorcycle. The front wheel did not show anysigns of impact but there was no air pressure inthe tyre.Vehicle involved:Motorrad Yamaha XV 1100 Virago (chopper).Consequences of the accident/injuries:The motorcyclist was fatally injured in the impactagainst a safety barrier post. The passenger sufferedserious injuries as a result of the fall. Themotorcycle sustained damage.3541 Photograph showingskid marks2 Final resting positionof the motorcycle3 Impact marks onthe post of the safetybarrier4 Pressureless tyre onthe front wheel5 Used damaged valve6 Valve caps compared7 Some of the protectiveclothing wornCauses of the problem:The tracks at the scene of the accident indicatedthat the motorcycle went out of control and toppledover due to a loss of air pressure in the fronttyre. Other reasons for the motorcycle to toppleover cannot be deduced from the findings at thescene of the accident. A laboratory test carriedout on the tubeless front tyre, which had been fittedshortly before the accident, together with thewheel rim, showed that the valve was old and hadozone cracks. It had been incorrectly fitted overa long period of time and was set at an angle. Inaddition, a heavy metal valve cap had been fittedwhich, in conjunction with the sloping position,placed additional pressure on the valve. Understatic pressure load the valve was not air tight,which quickly led to drop in tyre pressure duringdynamic movement.67Avoidance possibilities/approach to road safety measures:When the front tyre was replaced the valve shouldalso have been replaced. Downstand beams supportingthe safety barrier could have protected themotorcyclist, having been flung from his motorcycle,from impacting against the safety barrierposts.Other characteristics of the accident:Speed of the motorcycle prior to toppling over:approx. 60–65Both motorcycle passengers were wearing helmetsand appropriate attire with boots and gloves.
1Example 4SINGLE-VEHICLE ACCIDENT CAUSEDBY EXCESSIVE SPEED AND INADEQUATETREAD DEPTHSequence of events leading up to the accident:A motorcyclist was travelling along a winding roadoutside a built-up area. Following a depressionin the road, the motorcycle became unstable andcrashed into the right-hand safety barrier. It wasraining heavily at the time of the accident.Vehicle involved:Yamaha FR 1300.2 3 4Consequences of the accident/injuries:The motorcyclist was hurled beneath the safety barrierand sustained serious head and chest injuries,to which he succumbed at the scene of the accident.Causes of the problem:Before the motorcycle became unstable, it hadnegotiated a depression in the road on a right-handbend. The rear wheel tyre had a tread depth of 0.5mm in the centre and a tread depth of 1.6 mm atthe edge of the tread section. With the appropriateamount of water on the carriageway in conjunctionwith the reconstructed speed, the bank of the curveand the inadequate tread depth of the rear wheeltyre, the cause of the cause of the accident can beexplained by the handling of the motor cycle andthe technical deficiency of the tyre.Avoidance possibilities/approach to road safety measures:Instability as the cause of the accident could havebeen avoided if the speed limit had not been exceeded(especially considering the heavy rain!) and,in particular, the rear wheel tyre had had adequatetread depth. The fact that protectors were not fittedto the safety barrier posts at the time of teh accidentdid not have a negative effect in this case, as the motorcyclistdid not impact against the safety barrierposts. The motorcyclist’s injuries were caused by theimpact on the carriageway or by the impact of themotorcycle against the motorcyclist.Other characteristics of the accident:Initial speed of the motorcycle before it becameunstable: approx. 120–130 km/h.Speed of impact against the safety barrier:105–110 km/h.Permissible maximum speed in the area where theaccident happened: 80 km/h.571 Shape of the curve before the site ofthe accident2 Vertical post coverings not fitted at thetime of the accident3 Marks on the carriageway4 Rear tyre worn to below the minimumtread depth685 Marks on the safety barrier6 Motorcycle involved in the accident7 Impact marks on the safety barrier8 Stress marks and skid marks28 | 29
Page 1 and 2: DEKRA Automobil GmbHMotorcycle Road
Page 4: ContentsNOTEThis report deals with
Page 7 and 8: used quite differently from passeng
Page 9 and 10: Doichi Aoki of JAMA put it: “Were
Page 11: Self-assessment by motorcyclistsveh
Page 14: Road accidents and vehicle defects7
Page 18: Road accidents and vehicle defectss
Page 21 and 22: As far as defects in the assemblies
Page 23 and 24: significant defects had faulty tech
Page 25 and 26: 27The most common defects and assem
Page 27: 1Example 2CAR TURNS OUTSIDE A BUILT
Page 31 and 32: European motorcycle manufacturers
Page 33 and 34: The driver training of motorcyclist
Page 35 and 36: It is often the case that accidents
Page 37 and 38: There is a wide variety of safety h
Page 39 and 40: In 2006 the Honda Gold Wing was the
Page 41 and 42: moving passenger car - showed, in s
Page 44 and 45: Vehicle safetySafe cornering with s
Page 46 and 47: Vehicle safetyDepartment of Automot
Page 48 and 49: Vehicle safetyNEW AIRBAG SYSTEM IN
Page 50 and 51: Vehicle safetyTips on motorcycle ty
Page 52 and 53: Vehicle safetyCommon accident situa
Page 54 and 55: SummaryFurther effort is required t
Page 56 and 57: SummaryThe fact is that many accide
Page 58 and 59: ContactAny questions?ACCIDENT RESEA
Page 60: DEKRA Automobil GmbHHandwerkstraße

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