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Safety of a Downsized Vehicle Fleet: Effects of Mass Distribution, Impact Speed and Inherent Protection in Car-To-Car Crashes
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 01, 1999 by SAE International in United States
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Vehicle fleet downsizing has been discussed in Europe as an aspect to reduce fuel emissions. A recently developed mathematical model was used to study the individual effects of fleet mass distribution, impact speed reductions and inherent vehicle protection on average injury and fatality rates for downsized fleets. A baseline fleet of 700-2000 kg was downsized by a) reducing all vehicle masses by 10% or 20% and b) by removing all cars heavier than 1400 or 1200 kg.
The results showed that the safety can be maintained if the vehicle masses are reduced proportionally to their original mass. A higher safety level can be achieved by removing the heavier vehicles. Traffic safety can be further enhanced by impact speed reductions or by improvements of restraint systems and vehicle compatibility. The safety level would rise more by implementation of radar-activated brakes or controlling city speed limits than by intensified highway patrols, to eliminate crashes with impact speeds over 140 mph or with an average velocity change of 70 mph. However, a maximum impact speed at 100 mph would reduce the number of fatalities more effectively than a small reduction in all impact speeds.
It was concluded that a downsized fleet can result in fewer fatalities, depending on the downsizing strategy. Furthermore, the model can be used to estimate the effects of potential safety strategies.
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CitationJewkes, D., Lövsund, P., and Viano, D., "Safety of a Downsized Vehicle Fleet: Effects of Mass Distribution, Impact Speed and Inherent Protection in Car-To-Car Crashes," SAE Technical Paper 1999-01-0074, 1999, https://doi.org/10.4271/1999-01-0074.
Vehicle Aggressivity and Compatibility in Automotive Crashes
Number: SP-1442; Published: 1999-03-01
Number: SP-1442; Published: 1999-03-01
- Broughton, J. 1995 The likely effects of downsizing on driver casualties in two-car accidents TRL report, Project SR54 Crowthorne, United Kingdom
- Broughton J. 1996 The theoretical basis for comparing the accident record of car models Accident Analysis and Prevention 28 89 99
- Broughton J. 1996 Further aspects of the British index of secondary car safety Accident Analysis and Prevention 28 791 798
- Broughton J. 1996 The British index for comparing the accident record of car models Accident Analysis and Prevention 28 101 109
- Buzeman, D. G. Viano, D. C. Lövsund, P. 1998 Injury probability and risk in frontal crashes: effects of sorting techniques on priorities for offset testing Accident Analysis and Prevention 30 6
- Buzeman-Jewkes, D.G. Viano, D.C. Lovsund, P. 1998 Occupant risk, partner risk and fatality rate in frontal crashes: effects of changing vehicle fleet mass in 15 years. J. Crash Prevention and Injury Control
- Dreyer, W. Richter, B. Zobel, R. 1981 Handling, braking, and crash compatibility aspects of small front-wheel drive vehicles Proc. of SAE Conf.; SAE Paper No. 810792 Warrendale, PA
- Ernst, G. Bruhning, E. Glaeser, K-P. Schmid, M. 1991 Compatibility problems of small and large passenger cars in head-on collisions Proc. 13th Int. Techn. Conf. on ESV Paris 103 110
- Evans, L. Wasielewski, P. F. 1987 Serious or fatal driver injury rate versus car mass in head-on crashes between cars of similar mass Accident Analysis and Prevention 19 119 131
- Evans, L. 1989 Passive compared to active approaches to reducing fatalities Proc. 12th Int. Techn. Conf. on ESV Gothenburg 1149 1157
- Evans, L. 1991 Traffic safety and the driver New York Van Nostrand Rheinbold 248 250 0-442-00163-0
- Evans, L. 1993 Driver injury and fatality risk in two-car crashes versus mass ratio inferred using Newtonian mechanics Proc. 37th AAAM Conf. San Antonio, Texas
- Evans, L. Frick, M. C. 1993 Driver fatality risk in two-car crashes: dependence on masses of driven and striking car. Proc. 13th Int. Techn. Conf. on ESV; Paper No. 93-S1-O- 10 Paris 83 93
- Evans, L. 1994 Driver injury and fatality risk in two-car crashes versus mass ratio inferred using Newtonian mechanics Accident Analysis and Prevention 26 609 616
- Evans, L. 1994 Car size and safety: a review focused on identifying causative factors Proc. 14th Int. Techn. Conf. on ESV; Paper No. 94-S4-W-28 Munich 721 733
- FARS 1994 Traffic Safety Facts 1994, a compilation of motor vehicle crash data from the fatal accident reporting system and the general estimate system NHTSA, US-DOT 808-292 71 Washington DC
- Fountaine, H. Gourlet, Y. 1994 Securite des vehicules et de leurs conducteurs Rapport INRETS no. 175
- Hertz, E. 1997 The effect of decrease in vehicle weight on injury crash rates US DOT HS 808 575. NHTSA Technical report Washington D.C.
- Klein, T. M. Hertz, E. Borener, S. 1991 A collection of recent analyses of vehicle weight and safety US DOT HS 807 677, NHTSA Technical Report Washington D.C.
- Korner, J. 1996 Car crashworthiness and car size Internal communication Gothenburg, Sweden
- Kullgren A.
- Larsson, P. Lie, A. Tingvall, C. Krafft, M. Kullgren, A. 1996 The crash safety of new car models - a comparative accident study of new versus old car models Proc. 15th Int. Techn. Conf. on ESV, Paper No. 96-S9-O-13 Melbourne
- Malliaris A.C. Digges, K. H. DeBlois, J.H. 1997 Relationships between crash casualties and crash attributes Proc. of SAE Conf. Occupant protection and injury assessment in the automotive crash environment, SP-1231; SAE Paper No. 970393 Detroit 177 188
- Marumo, N. Aya, N. Takahashi, K. Nousho, H. 1974 Compatibility between different-sized vehicles on crash survivability Proc. 3rd Int. Congress on Automotive Safety I 8_1 8_39
- Mizuno, K. Yonezawa, H. 1996 The effect of vehicle mass in car-to-car collisions Proc. of SAE Conf. Vehicle Safety Technology, SP-1139; SAE Paper No. 960441 Warrendale, PA 83 91
- Official Statistics of Sweden (OSS) 1996 Traffic Injuries 1995 Swedish Institute for Transport and Communications Analysis, Statistics Sweden 91-618-0818-0 0283-8540
- Richter, B. Zobel, R. 1982 Aspects of the passive safety motor vehicles Proc. 9th Int. Techn. Conf. on ESV Kyoto 759 765
- Tarriere, C. Morvan, Y. Steyer, C. Bellot, D. 1994 Accident research and experimental data useful for an understanding of the influence of car structural incompatibility on the risk of accident injuries Proc. 14th Int. Techn. Conf. on ESV Munich 593 609
- Thomas, C. Faverjon, G. Henri, C. Le Coz, J.Y. Got, C. Patel, A. 1990 The problem of compatibility in car-to-car collisions' Proc. 34th AAAM Conf Scottsdale, AZ 253 268
- Tingvall C. The implications of the zero-vision on biomechanical research Proc. Int. IRCOBI Conf. Dublin 11 18
- Wood, D.P. Mooney, S.J. 1996 Car size and relative safety: fundamental theory and real life experience compared Proc. Int. IRCOBI Conf. Dublin 223 239
- Wood, D.P. 1997 Safety and the car size effect: a fundamental explanation Accident Analysis and Prevention 29 139 151
- Wood, D.P. Money, S. Doody, M. O'Riordáin, S. 1993 The influence of car crush behavior on frontal collision safety and the car size effect Proc. SAE Conf. Vehicle and Occupant Kinematics: Simulation and Modeling; SAE Paper No. 930893 Warrendale, AZ