Driver Facts

Children

 http://www.usroads.com/journals/aruj/9802/ru980201.htm
Auto and Road User Journal
February 2, 1998
TranSafety, Inc.
info@usroads.com

 In 1996, there were almost 58 million children under 15 years old in the United States. This age group (0-14 years) made up 22 percent of the total U.S. resident population in 1996. Motor vehicle crashes are the leading cause of death for children of every age from 6 to 14 years old (based on 1993 figures, which are the latest mortality data currently available from the National Center for Health Statistics).

In 1996, there were a total of 41,907 traffic fatalities in the United States.
  • The 0-14 age group accounted for 7 percent (2,761) of those traffic fatalities.
  • Children under 15 years old accounted for 5 percent (1,811) of all vehicle occupant fatalities, 10 percent (358,000) of all the people injured in motor vehicle crashes, and 9 percent (305,000) of all the vehicle occupants injured in crashes.
  • In the United States, an average of 8 children 0-14 years old were killed and 980 were injured every day in motor vehicle crashes during 1996.
  • In the 0-14 year age group, males accounted for 58 percent of the fatalities and 48 percent of those injured in motor vehicle crashes during 1996.
 
Child Endangerment
  • In 1996, nearly 21 percent of the children under 15 years old who were killed in motor vehicle crashes were killed in alcohol-related crashes.
  • Of the children 0-14 years old who were killed in alcohol-related crashes during 1996, almost half (259) were passengers in vehicles with drivers who had been drinking, with blood alcohol concentration (BAC) levels of 0.01 gram per deciliter (g/dl) or higher.
  • An additional 137 children were killed as passengers in vehicles with drivers who had not been drinking.
  • Another 95 children under 15 years old who were killed in traffic crashes in 1996 were pedestrians or pedal cyclists who were struck by drinking drivers (BAC 0.01 g/dl).
 
Pedestrians
 
In 1986, there were 1,023 pedestrian fatalities in the 0-14 year age group.
  • From 1986 to 1996, the number of pedestrian fatalities in this age group decreased by 35 percent, with the 5-9 year age group showing the largest decrease.
  • There were 5,412 pedestrian fatalities in 1996. The 0-14 age group accounted for 666 (12 percent) of those fatalities, and 65 percent of the pedestrian fatalities in this age group were males.
  • In addition to the pedestrians under 15 years old who died, 26,000 were injured in motor vehicle crashes.
  • These young pedestrians accounted for 32 percent of the total pedestrians injured in motor vehicle crashes in 1996. Nearly one-fourth (24 percent) of the traffic fatalities in the 0-14 year age group were pedestrians.
  • During 1996, 45 percent of the young pedestrian fatalities occurred between the hours of 4 pm and 8 pm, and 78 percent occurred at non-intersection locations.
 
Pedal cyclists
 
A total of 761 pedal cyclists were killed in motor vehicle crashes in 1996.
  • Children 0-14 years old accounted for 223 (29 percent) of those fatalities.
  • In 1996, 41 percent of the pedal cyclists injured in motor vehicle crashes were under 15 years old.
  • The 223 pedal cyclist fatalities in 1996 for the 0-14 year age group represent a decrease of 44 percent from the 397 killed in 1986. Bicycle helmets are 85 to 88 percent effective in mitigating head and brain injuries in all types of bicycle incidents, making the use of helmets the single most effective countermeasure available to reduce head injuries and fatalities resulting from bicycle crashes. (Source: Robert Thompson, A Case Control Study of the Effectiveness of Bicycle Safety Helmets. Centers for Disease Control.)
 
Restraints
  • Research has shown that lap/shoulder safety belts, when used, reduce the risk of fatal injury to front seat occupants (age 5 years and older) of passenger cars by 45 percent and the risk of moderate-to-critical injury by 50 percent.
  • For light truck occupants, safety belts reduce the risk of fatal injury by 60 percent and the risk of moderate-to-critical injury by 65 percent.
  • During 1996, 9,151 motor vehicle occupants under 15 years old were involved in fatal crashes.
  • For those children, where restraint use was known, 45 percent were unrestrained; among those who were fatally injured, 62 percent were unrestrained.

 

Effects of Fatigue

 http://www.usroads.com/journals/aruj/9702/ru970204.htm
Auto and Road User Journal
Copyright © 1997 by TranSafety, Inc.
February 1, 1997
TranSafety, Inc.
1-800-777-2338
(U.S. and Canada)
(360) 683-6276
Fax: (360) 683-6719
info@usroads.com
Coping With Driver Fatigue
 
While Deborah M. Freund, author of "Coping with Driver Fatigue, Loss of Alertness, and Vigilance," expressed her opinion that drivers are seldom literally asleep when they have accidents, she also pointed out that statistics specify "operator error" as a cause in 70 to 90 percent of accidents. Moreover, 30 to 40 percent of commercial vehicle accident reports suggest operator fatigue as a component cause.
 
 
 

Older Driver Improvement

 http://www.usroads.com/journals/aruj/9702/ru970208.htm
Auto and Road User Journal
Copyright © 1997 by TranSafety, Inc. February 1, 1997
TranSafety, Inc.
1-800-777-2338
(U.S. and Canada)
(360) 683-6276
Fax: (360) 683-6719
info@usroads.com
Improving Highways for Older Driver Use
 
The number of people over 75 years of age will double by the year 2000, and people over 65 will make up 20 percent of the United States population by 2020.
  • Statistics show that senior drivers have a high rate of accidents, injuries, and fatalities for each mile they drive; however, the ability of older people to maintain an independent lifestyle often depends on continuing to drive. Therefore, the Federal Highway Administration (FHWA) considers research related to designing roadways that are safer and more usable for seniors a top priority.
 
Efforts to address these problems have focused on making traffic signs bigger and brighter.
  • A 1990 study showed that for older drivers to read signs as well as their younger counterparts, they may need sign letters to be 30 percent larger.
  • Since a one-third increase in letter size may require a 60 to 80 percent increase in sign size, making letters bigger becomes an expensive solution.
  • A 1994 study showed that younger drivers could read traffic signs farther away in daylight than in darkness (600 feet in daylight and 300 feet at night).
  • Older drivers, however, needed as much distance to read a sign during the day as they did at night.
  • Experiments with taller lettering on traffic signs showed that making letters more than 16 inches high brought diminishing results. Therefore, FHWA is studying other ways to revise traffic signs for older drivers.
 
Research suggested that redundant signing sometimes improved accuracy and speed of decision making for older drivers confronted by protected left-turn intersections or changeable-message signs. The authors cautioned that visual clutter is, however, also a problem for older drivers. Consequently, highway designers must balance the benefits of redundant signing against the creation of too much background clutter.
 
Design engineers often use percentiles as cut-off standards for engineering legible traffic signs. However, studies showed that regulatory and construction signs that met legibility requirements for younger drivers safely satisfied the needs of only 85 percent of older drivers. Guide signs meeting the requirements of younger drivers met the needs of only 50 percent of older drivers. Further analysis "showed that larger signs with engineering grade materials are generally more cost effective/efficient that smaller signs with diamond grade sheeting for initial implementation." The authors recommended more research in these areas.
 
Another FHWA study addressed the benefits of using symbol signs rather than text signs--a practice that has been increasing in popularity since the 1970s.
  • Of the 85 signs investigated, only 28 were understood by more than 90 percent of respondents, and 10 signs were understood by only 10 percent of respondents.
  • Younger drivers showed a better understanding of 39 percent of the symbol signs than did older drivers.
  • As with text signs, older drivers showed longer recognition distances for symbol signs than their young and middle-aged counterparts.
  • Moreover, recognition distances for older drivers varied significantly from sign to sign and from daytime to darkness.
  • Finally, research tested "glance legibility" for a set of 18 symbol signs--6 with good ratings for comprehension and recognition distance, 6 with intermediate ratings, and 6 with poor ratings.
  • Older drivers showed longer glance legibility times overall, and the results showed the greatest differences for the poorly rated signs.
 
A second phase of symbol sign studies used 7 modified, 6 redesigned, and 5 novel signs. Modification and redesign efforts focused on removing fine detail and increasing the space between symbol elements. This
resulted in simpler, bolder symbol signs. More drivers, young and old, understood the modified and redesigned signs, and all drivers could recognize them from greater distances.
 
Object Markers
 
Research showed that all drivers had difficulty with object markers that identify hazards on or near the roadway.
  • Studies focusing on the most effective size, shape, and color for markers showed that research participants noticed only 39 percent of the object markers they viewed in slide-based test situations.
  • Best understood were Type 3 markers (1-by-3-foot vertical rectangles with black and yellow 45-degree stripes) followed by Type 2 markers (small yellow or white rectangles with yellow reflectorized buttons).
  • Least effective were Type 1 markers (18-inch yellow diamonds or yellow or black diamonds with reflectorized yellow buttons).
  • Preferences varied according to the age of drivers. Older drivers preferred diamonds or circles that depicted the actual hazard on a white background, and younger drivers preferred square signs with abstract symbols and green or yellow-green backgrounds. The authors did not mention color preferences for the symbols.
 
Geometric Design
 
Standards for roadway geometric designs depend on such human factor requirements as intersection sight distance, stopping sight distance, and decision sight distance.
  • While all sight-distance requirements appeared to increase with age, American Association of Highway and Transportation Officials' (AASHTO's) standards providing 2 seconds of perception-reaction time for intersection sight distance seemed adequate for drivers of all ages.
  • Researchers also observed that younger drivers showed shorter average perception-reaction times for stopping sight distance than older drivers; however, AASHTO's design value of 2.5 seconds stopping sight distance also proved adequate here for all drivers.
  • Older drivers compensate for increased perception-reaction times by such strategies as reducing driving speeds and eliminating distractions within their vehicles. Older drivers had slower perception-reaction times than younger drivers in situations requiring them to make complex decisions or execute unexpected maneuvers. Researchers found that overall perception-reaction times in such situations for drivers 20 to 40 years old were 3.6 seconds compared with 4.5 seconds for 65 to 69 year olds and 5.5 seconds for drivers 70 and over. However, of the older drivers who talked with researchers in focus groups, only 28 percent said they thought their reaction times were slower than the "average" driver. Only 18 percent thought their reaction times had slowed over the last ten years.

 

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