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Motor-vehicle safety: a 20th century public health achievement.

The reduction of the rate of death attributable to motor-vehicle crashes in the United States represents the successful public health response to a great technologic advance of the 20th century-the motorization of America. Six times as many people drive today as in 1925, and the number of motor vehicles in the country has increased 11-fold since then to approximately 215 million. The number of miles traveled in motor vehicles is 10 times higher than in the mid-1920s. Despite this steep increase in motor-vehicle travel, the annual death rate has declined from 18 per 100 million vehicle miles traveled (VMT) in 1925 to 1.7 per 100 million VMT in 1997-a 90% decrease.

Accidents, Traffic↗

Motor vehicle crashes and violations among drivers with multiple sclerosis.

OBJECTIVE: To investigate differences in the incidence of motor vehicle crashes (MVCs) and violations among drivers with multiple sclerosis (MS) when cognitive impairment is present. DESIGN: Archival evaluation of Department of Motor Vehicles (DMV) records. SETTING: Medical rehabilitation research organization. PARTICIPANTS: Community-dwelling drivers, 27 subjects with documented MS (14 MS without cognitive impairment [MS-], 13 MS with cognitive impairment [MS+]) and 17 healthy control subjects, matched on age, sex, and driving experience. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Incidence of MVCs and motor vehicle violations as documented by DMV reports for the past 5 years. RESULTS: MS+ subjects showed a higher incidence of MVCs when compared with control and MS- subjects. No significant difference in the incidence of motor vehicle violations was observed between groups. CONCLUSIONS: The presence of cognitive impairment in drivers with MS can result in an increased risk of MVC involvement.

Accidents, Traffic↗

Injury patterns and preventability in prehospital motor vehicle crash fatalities in Victoria.

OBJECTIVE: To examine the pattern of anatomical injury in victims of motor vehicle crashes who die prior to reaching hospital. Cases were identified where death was an unexpected outcome. METHODS: A retrospective review of autopsy case records including police reports, of all persons who died in motor vehicle crashes between 1 January 1998 and 31 December 1999 and underwent full autopsy at the Victorian Institute of Forensic Medicine (VIFM). Those cases where the victim died in the prehospital phase were examined. Abbreviate Injury Scores and Injury Severity Scores were calculated in each case. Bull's probit analysis was used to identify unexpected deaths. RESULTS: There were 352 motor road crash fatalities identified that underwent autopsy at the VIFM in the study period. Two hundred and six of these were prehospital deaths involving motor vehicles, which satisfied specified criteria. 82% (95% CI: 77.7-86.3%) of cases had Abbreviated Injury Scores of 5 (critical) or 6 (incompatible with life). 80.1% (95% CI: 75.7-84.5%) had an Injury Severity Score greater than 40. 36.9% (95% CI: 34.5-39.3%) of cases had the maximum Injury Severity score of 75. 88.8% (95% CI: 85-92.7%) of cases sustained a head injury and 83.9% (95% CI: 79.8-88.2%) a chest injury. Possibly preventable fatality was identified in 30 (14.6% 95% CI: 13.9-15.3%) cases. CONCLUSION: In motor vehicle crash fatalities, most victims who die before reaching hospital do so because of major injury, with the head and chest the commonest regions involved. A large proportion of these injuries could be considered unsurvivable regardless of treatment. Earlier intervention or retrieval of such patients is unlikely to influence outcome in the majority of cases.

Abbreviated Injury Scale↗

Deaths resulting from firearm- and motor-vehicle-related injuries--United States, 1968-1991.

Injury is the leading cause of death for persons aged 1-44 years in the United States. More than half (55%) of all injury-related deaths are caused by motor vehicles and firearms. Although the number of deaths from motor-vehicle crashes has exceeded those from firearms, since 1968, differences in the number of deaths have declined: from 1968 through 1991, motor-vehicle-related deaths decreased by 21% (from 54,862 to 43,536) while firearm-related deaths increased by 60% (from 23,875 to 38,317). Based on these trends, by the year 2003, the number of firearm-related deaths will surpass the number of motor-vehicle crashes, and firearms will become the leading cause of injury-related death (Figure 1). This report compares trends and patterns of deaths resulting from firearm- and motor-vehicle-related injuries in the United States from 1968 through 1991.

Accidents, Traffic↗

Effect of air bags and restraining devices on the pattern of facial fractures in motor vehicle crashes.

OBJECTIVE: To examine the relationship between the use of restraining devices and the incidence of specific facial fractures in motor vehicle crashes. DESIGN: Retrospective analysis of patients with facial fractures following a motor vehicle crash. SETTING: University of Alabama at Birmingham Hospital level I trauma center from 1996 to 2000. PATIENTS: Of 3731 patients involved in motor vehicle crashes, a total of 497 patients were found to have facial fractures as determined by International Classification of Diseases, Ninth Revision (ICD-9) codes. Facial fractures were categorized as mandibular, orbital, zygomaticomaxillary complex (ZMC), and nasal. RESULTS: Use of seat belts alone was more effective in decreasing the chance of facial fractures in this population (from 17% to 8%) compared with the use of air bags alone (17% to 11%). The use of seat belts and air bags together decreased the incidence of facial fractures from 17% to 5%. CONCLUSIONS: Use of restraining devices in vehicles significantly reduces the chance of incurring facial fractures in a severe motor vehicle crash. However, use of air bags and seat belts does not change the pattern of facial fractures greatly except for ZMC fractures. Air bags are least effective in preventing ZMC fractures. Improving the mechanics of restraining devices might be needed to minimize facial fractures.

Accidents, Traffic↗

Motor vehicle fatalities in the United States construction industry.

A death certificate-based surveillance system was used to identify 2144 work-related motor vehicle fatalities among civilian workers in the United States construction industry over the years 1980-92. Construction workers were twice as likely to be killed by a motor vehicle as the average worker, with an annual crude mortality rate of 2.3/100,000 workers. Injury prevention efforts in construction have had limited effect on motor vehicle-related deaths, with death rates falling by only 11% during the 13-year period, compared with 43% for falls, 54% for electrocutions and 48% for machinery. In all industries combined, motor vehicle fatality rates dropped by 47%. The largest proportion of motor vehicle deaths (40%) occurred among pedestrians, with construction accounting for more than one-fourth of all pedestrian deaths. A minimum of 54 (6%) of these pedestrian fatalities were flaggers or surveyors. Flaggers accounted for half the 34 pedestrian fatalities among women, compared with only 3% among men. Along with previous studies and recent trends in the amount and type of road construction, these results underscore the need for better traffic control management in construction work areas to reduce pedestrian fatalities. As the second leading cause of traumatic death in construction, with an annual average share of 15% of the total deaths, exceeded only by falls, prevention of work-related motor vehicle research should become a greater priority in the construction industry.

Accidents, Occupational↗

Risk factors for seizure-related motor vehicle crashes in patients with epilepsy.

OBJECTIVE: We identified clinical risk factors for seizure-related motor vehicle crashes in patients with epilepsy. BACKGROUND: Current US laws permit epilepsy patients with controlled seizures to drive. These laws attempt to balance the important economic and social value of driving with the risk to public safety from seizure-related crashes. Various clinical factors are considered in these laws, particularly the seizure-free interval. Driving restrictions range from 3 to 18 months, however, and studies have not established how these various seizure-free intervals and other clinical factors influence the risk for seizure-related motor vehicle crashes. METHODS: We performed a retrospective case-control study to determine the influence of clinical risk factors associated with seizure-related motor vehicle crashes. Both "case" and "control" patients had epilepsy, drove, and were from the same clinic, but the cases differed in having had seizure-related crashes. RESULTS: Fifty patients with epilepsy who crashed during seizures and 50 matched control patients were compared. Factors that significantly decreased the odds of patients with epilepsy having motor vehicle crashes due to seizures were: long seizure-free intervals, reliable auras, few prior nonseizure-related accidents, and having had their antiepileptic drugs (AEDs) reduced or switched. For example, patients who had seizure-free intervals > or = 12 months had a 93% reduced odds for crashing compared to patients with shorter intervals. Other findings were: 25% of patients had more than one seizure-related crash and 20% had missed an AED dose just prior to their crash. The majority (54%) of patients who crashed were driving illegally, with seizure-free intervals shorter than legally permitted. CONCLUSION: Seizure-free intervals, the presence of reliable auras, AED therapy modifications, and a history of nonseizure-induced crashes should be considered when counseling patients with epilepsy on driving and when formulating driving regulatory policy. Case control studies of crashes due to seizures can help in assessing and monitoring such risks.

Accidents, Traffic↗

Accidental strangulation by a motor vehicle window.

OBJECTIVE: To describe a child who was asphyxiated by a motor vehicle window and to review the relevant literature. DESIGN: Case report. SETTING: A 402-bed tertiary care medical center in La Crosse, WI. PATIENT: Four-year-old girl. INTERVENTIONS: Supportive pediatric critical care. MAIN OUTCOME MEASURES: None. RESULTS: The patient did not survive. CONCLUSIONS: Parents must assume responsibility for restraining their children in motor vehicles. Parents must not leave children alone in motor vehicles. Parents must become "more injury literate."

Accident Prevention↗

Reduction in motor vehicle fatalities associated with an increase in the minimum drinking age.

Motor vehicle injuries are responsible for nearly 40% of the deaths that occur among persons aged 15 through 24 years. Approximately half of these deaths involve drunk drivers. In response to the problem of driving under the influence of alcohol (DUI), some states raised their minimum drinking age, increased penalties for DUI, or both. Other states vigorously resisted federal pressure to increase their drinking age, and some researchers have questioned the utility of this approach. Tennessee increased penalties for DUI in 1982 and raised the drinking age to 21 years in 1984. Alcohol-related motor vehicle deaths declined by 33% among persons aged 15 through 18 years, probably because of publicity. Our results suggest that it may be particularly important to maintain continuous, high-profile anti-DUI programs within high schools. Alcohol-related motor vehicle deaths declined 38% among persons aged 19 through 20 years; this effect appears to be attributable to the increase in drinking age and to be durable despite decreased publicity.

Accidents, Traffic↗

Motor vehicle safety, health care, and taxes. National Highway Traffic Safety Administration, U.S. Department of Transportation.

INTRODUCTION: Motor vehicle injuries are a major public health problem. They are a primary cause of: 1) death and injury in the United States; and 2) result in a substantial loss of productive life. These injuries and fatalities have serious social and economic consequences for the injured individual, their families, and society. This report focuses on the portion of health care expense borne by the public and the tax revenue implications of these injuries and fatalities. METHODS: The relationship between motor vehicle injuries and fatalities, health care costs, and income taxes was analyzed for four situations: 1) 1990 baseline; 2) achievement of modest goals for safety improvements; 3) population growth with constant injury and fatality rates; and 4) the effect of higher injury and fatality rates. Total health care costs, publicly funded health care costs, lost income tax revenue, and increased public assistance were estimated at the [U.S.] federal level, and at the state and local level. RESULTS: Study of these relationships indicate that: 1) the lifetime economic cost of motor vehicle injuries, fatalities, and property damage that occurred in 1990 is $137.5 billion. American taxpayers will pay $11.4 billion of that total to cover publicly funded health care ($3.7 billion), reduced income tax revenue ($6.1 billion), and increased public assistance expenses ($1.6 billion); 2) the lifetime economic cost of alcohol-related, motor vehicle injuries, fatalities, and property damage that occurred in 1990 was $46.1 billion. Of this, the American taxpayer will pay $1.4 billion to cover publicly funded health care and $3.8 billion to cover reduced income tax revenue and increased public assistance; 3) reducing the percentage of the alcohol-related portion of these fatalities from 45% to 43% (1,200 lives saved), and alcohol-related injuries by a proportionate amount, would save American taxpayers $73 million in publicly funded health care and $208 million in income taxes and public assistance; 4) by increasing observed safety-belt usage in passenger cars from 62% to 75%, (1,700 lives saved plus a proportionate reduction in injuries), publicly funded health care costs would be reduced by $180 million, and $328 million would be saved in the combination of increased income tax revenues and reduced public assistance; 5) Further reductions in publicly funded health care, increases in income tax revenues, and reductions in public assistance are possible as a result of reasonable gains in other areas, such as increased safety-belt usage in light trucks, increased usage of motorcycle helmets, increased correct usage of child safety seats, and reducing the number of speeding drivers; 6) if injury and fatality rates remain at the 1992 level, population increases alone would result in 3,300 more fatalities in the year 2000. Economic costs from these fatalities and a proportionate increase in injuries would increase by an estimated $7.4 billion, including a $277 million increase in publicly funded health care costs, and $573 million in reduced income tax revenue and increased public assistance; and 7) if injury and fatality rates increase from the 1992 level, injuries, fatalities, and costs will increase. In one scenario, with 5,800 more fatalities than the population growth scenario, economic costs would increase by $13 billion, including a $350 million increase in publicly funded health care, and an additional $1 billion in taxes to cover lost income tax revenue and increased public assistance. CONCLUSIONS: It is obvious that inaction is a costly alternative and that anticipated population gains will require further reductions in injury and fatality rates just to maintain current injury and fatality rates. Fortunately, countermeasures are to be available that can accomplish this. Lack of vigilance that would result in deterioration of safety levels would be even more costly.

Accidents, Traffic↗

Worldwide pattern of mortality from motor vehicle accidents, 1950-1990.

Trends in age-specific and age-standardized death certification rates from motor vehicle accidents over the period 1950-1990 were analyzed for 48 countries from four continents (2 from North America, 10 from Latin America, 8 from Asia, 26 from Europe, Australia and New Zealand) on the basis of data produced by the World Health Organization mortality database. In most developed western and Asiatic countries, mortality rates increased until the late 1960's or early 1970's, and declined thereafter to reach values often lower than those of the early 1950's, although the number of circulating vehicles has substantially increased over the same calendar period. The extent of the decline was, however, different in various countries, as well as in the two sexes and in various age groups, thus leading to complex cohort and period patterns. In general, countries (like the U.S.A. or U.K.), where the number of motor vehicles had increased earlier, have now comparatively higher rates at younger than at middle and older age, while the opposite is observed in countries with later spread of motor vehicles. Further, there were a few countries, including Kuwait, Venezuela and several other Latin American countries, Australia and New Zealand, and several southern and eastern European countries, with exceedingly high rates from motor vehicle accidents, and where comprehensive interventions on this important cause of death are therefore a public health priority.

Accidents, Traffic↗

Motor vehicle fatalities increase just after publicized suicide stories.

The average increase in motor vehicle fatalities is 9.12 percent in the week after a suicide story. The more publicity given to the story, the greater the rise in motor vehicle deaths thereafter. This rise apparently occurs because suicide stories stimulate a wave of imitative suicides, some of which are disguised as motor vehicle accidents.

Accidents, Traffic↗

Prospective countywide evaluation of the effects of motor vehicle safety device use on hospital resource use and injury severity.

STUDY OBJECTIVE: We evaluated the efficacy of safety devices (seat belts and air bags) on hospital resource use and injury severity while controlling for variables known to affect outcome of motor vehicle crashes. METHODS: We conducted a prospective observational study of motor vehicle crash victims who were transported to the hospital in a suburban-rural county with a population of 1.4 million. Out-of-hospital providers recorded patient demographic characteristics, mechanism of injury (based on American College of Surgeons criteria), and use of seat belts or air bags. Hospital charts were reviewed for hospital admission, length of hospital stay, ICU stay, surgery, major nonorthopedic surgery or death, and severe injury (Injury Severity Score > 15). RESULTS: The study group comprised 1,446 motor vehicle crash victims. Median age was 30 years, 47% were male, and 69% used safety devices. The use of safety devices reduced the likelihood of hospital admission (adjusted odds ratio [OR], .67; 95% confidence interval [CI], .46 to .98) surgery (adjusted OR, .52; 95% CI, .27 to 1.01), major surgery or death (adjusted OR, .14; 95% CI, .04 to .52), and severe injuries (adjusted OR of injury Severity Score > 15, .39; 95% CI, .19 to .83). CONCLUSION: The use of safety devices is associated with decreased hospital resource use and less severe injuries for victims of motor vehicle crashes who are transported to the hospital by emergency medical services providers, even after adjustment for many other variables known to affect the outcome of motor vehicle crashes. Continued efforts to promote safety device use are warranted.

Accidents, Traffic↗

High risk characteristics for motor vehicle crashes in persons with diabetes by age.

Studies highlight a higher involvement of drivers with diabetes in motor vehicle accidents. Extensive debate, though, exists over the most appropriate approach to license these drivers. Risk factors for crashes in persons with diabetes are not well defined. In this report, motor vehicle crash involvement was identified in two cohorts of persons with type 1 diabetes to identify if crash patterns and characteristics differ by age. Overall, reported crashes decline with age in persons with and without diabetes, but the crash risk remained higher for persons with diabetes throughout the age span. No relationship was observed between diabetes complications, blood glucose control, and diabetes treatment patterns and motor vehicle crashes. Severe hypoglycemia, though, was consistently and strongly related to crashes at all ages. The findings suggest that the crash risk related to hypoglycemia does not diminish markedly in persons with Type 1 diabetes, despite changes in health and age. Several reports highlight the involvement of drivers with diabetes in motor vehicle crashes [Charlton, 2004]. Extensive debate exists, though, over the role of diabetes in these crashes and licensing policy differs, worldwide, for these drivers. The natural history of type 1 diabetes (worsening health outcomes over time) indicates that factors influencing crashes in persons with diabetes may change over time. Few reports, though, have examined the factors related to crashes in persons with diabetes by age.

Accidents, Traffic↗

Humeral shaft fractures as predictors of intra-abdominal injury in motor vehicle collision victims.

To assess the utility of humeral shaft fractures as predictors of organ injuries and skeletal injuries in multiply injured patients involved in motor vehicle collisions (MVCs). A prospectively collected database of multiply injured motor vehicle occupants with an Injury Severity Score (ISS) greater than 12 admitted to a level I regional trauma centre during a 102-month period (January 1992 to June 2000) was reviewed to assess skeletal and organ injuries associated with a humeral shaft fracture. The effect of occupant location within the vehicle, the point of collision, and the use of a seat belt restraint was also examined to identify trends in injury patterns. Data from 1070 motor vehicle occupants - 65 with concomitant humeral shaft fractures and 1005 without humeral shaft fractures - revealed that 63% of motor vehicle occupants who sustained humeral fractures were drivers, compared with 77% in the non-humeral fracture group. Those patients who sustained a humeral shaft fracture had a significantly greater number of liver injuries (p = 0.022), forearm/hand fractures (p < 0.001), tibial fractures (p < 0.01) and femoral fractures (p < 0.01) compared with controls. A lateral collision impact showed a trend towards increased splenic and hepatic injuries within the humeral shaft fracture group. The presence of a humeral shaft fracture in a multiply injured patient involved in a MVC is significantly associated with an increased incidence of both upper and lower extremity fractures and liver injury. Moreover, humeral shaft fractures may serve as a predictor of potential intra-abdominal pathology in multiply injured trauma patients involved in MVCs.

Abdominal Injuries↗

Thermal trauma resulting from motor vehicle operation or maintenance.

Burn injury may result from the operation or maintenance of motor vehicles. We reviewed the experience of one burn center with injuries related to motor vehicle use over the 6 year period 1987-1992. One hundred and fifty patients with motor vehicle related burns were identified comprising 11.3% of all admissions for this period. The mean extent of burn injury was 22.8% total body surface area with a mean full thickness (third degree) burn size of 11.7%. The average hospital length of stay was 42.41 days. The most common mechanisms of injury were collisions resulting in fire (n = 48), carburetor priming (n = 37) and scalding from radiator fluid contact (n = 27). Burns resulting from vehicle operation or maintenance are costly and potentially preventable.

Accidents, Traffic↗

Injury pattern and severity in lateral motor vehicle collisions: a Canadian experience.

OBJECTIVE: To determine the pattern and severity of injury and the outcome of front seat motor vehicle occupants after lateral impact crashes. DESIGN: Retrospective review undertaken in a Regional Trauma Unit (Sunnybrook Health Science Centre). MATERIALS AND METHODS: Review of seriously injured front seat motor vehicle occupants admitted to a Regional Trauma Unit over a 46-month period (September 15, 1989, to July 15, 1993) for whom vehicle crash information and occupant seat belt use were known. MEASUREMENTS AND MAIN RESULTS: Three hundred forty-eight front seat vehicle occupants were available for study; one hundred forty-one (41%) were involved in a lateral impact motor vehicle crash. Driver side lateral crashes (57%) were more common than passenger side impacts. Victims of lateral impact crashes had a significantly higher mean Injury Severity Score (25 compared with 20 for nonlateral crashes: p < 0.05), and the direction of impact was strongly associated with injury severity (p < 0.05). Lateral impact crashes resulted in substantially more significant chest (p < 0.01) and intra-abdominal (p < 0.0001) injuries. Type of injury was significantly different between the lateral and nonlateral impact groups for facial, chest, abdominal, and musculoskeletal injuries. CONCLUSIONS: The direction of impact in motor vehicle crashes is strongly associated with the pattern and severity of organ injuries. Further attention to automobile safety design is necessary to better protect occupants involved in lateral impact crashes.

Accidents, Traffic↗