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Interface pressure and the prediction of car seat discomfort.

The technique of interface pressure measurement has generated considerable interest in the automotive industry as a method, which could be used to predict driver discomfort during the development of prototype seat designs. Two repeated measures experiments were carried out to evaluate the practical application of the technique. The variables of foam density and posture were used to create discomfort, the whole emphasis of the work being to generate results with real-world applicability. A clear, simple and consistent relationship between interface pressure and driving discomfort was not identified. Future studies using this technique should provide information regarding such factors as gender, body mass, anthropometric data, posture and foam hardness due to the confounding nature of these variables.

Adult↗

Vehicles driven by teenagers in their first year of licensure.

OBJECTIVE: to determine access to vehicles, vehicle ownership and its correlates, and types of vehicles driven by teenagers during their first year of licensure. METHODS: About 3,500 Connecticut teenagers and their parents recruited at DMV offices participated in a study aimed at persuading parents to impose and maintain driving restrictions on their sons and daughters. Telephone interviews with teens and parents, which included questions on vehicles driven, were conducted upon licensure and at intervals throughout the year. RESULTS: The majority of both male and female teens owned vehicles immediately upon licensure. Family income and number of vehicles in the family were associated with early ownership. A year later 74% owned vehicles. Small cars, which provide inferior crash protection, were the most popular vehicle; the percent driving small cars increased from 36% to 42% over the year. About 25% were driving SUVs, pickups, or sports cars, which may increase crash risk for young beginners. One year after licensure, only 35% of teens were driving midsize or large passenger cars, the types of vehicles recommended for them, and about one-third of these vehicles were 10 or more years old. Owners were more likely than non-owners to drive older and smaller vehicles, to drive more miles, do more risky driving, and to have more traffic violations and crashes. DISCUSSION: Many teenagers in Connecticut were driving vehicles that rank low in crash protection or may increase crash risk. Attention to the young driver problem has been focused primarily on managing driving risks through graduated licensing systems. More attention needs to be given to the vehicles teens drive, and how decisions about vehicle type and ownership are made. Parents exert control over what vehicles their sons and daughters drive, and may benefit from information on how to make choices that better balance cost, safety, and other factors that go into these decisions.

Accidents, Traffic↗

How to modify the risk-taking behaviour of emergency medical services drivers?

High speed and an aggressive style of driving are major risk factors for serious traffic accidents. Consequently, frontline emergency medical services vehicles have an increased collision risk. We report on two studies designed to modify the risk-taking behaviour of emergency medical services drivers. In the first study, we compared the travel intervals for a second tier unit using two different types of vehicles. We found that the replacement of a sports estate by an ambulance, which can be considered more or less as a change from a speedy and aggressive style of driving to a cautious style of driving with respect for the speed limits, resulted in an increase of the travel interval of only 10-20%. In the second study we found that the installation of a 'black box' in an emergency medical services vehicle, combined with well-defined guidelines for the drivers and a close monitoring system, provides fair but still not optimal results with regard to maximum speed and the occurrence of harsh braking events. Despite some limitations in the study designs, we conclude that for second tier units only a small amount of time is gained by high speed and an aggressive style of driving. Furthermore, we are convinced that a 'black box' is a good tool to modify the risk-taking behaviour of emergency medical services drivers.

Accidents, Traffic↗

Antihistamines, drowsiness, and psychomotor impairment: central nervous system effect of cetirizine.

Altered central nervous system function as indicated by drowsiness and impaired psychomotor performance is often a consequence of the use of traditional antihistamines. Demonstration that newer agents lack these CNS effects requires quantitative and objective measurements that are sensitive enough to assess the psychomotor capabilities required for such activities as driving an automobile. These capabilities include extended attention span, vigilance, visual tracking, rapid information processing, and reaction time. We have used several psychomotor function tests to conduct two investigations assessing the CNS effects of cetirizine. In the first study, 12 healthy, atopic subjects received single oral doses of hydroxyzine 25 mg, cetirizine 10 mg and 20 mg, and placebo in a double-blind, four-way crossover study. Skin-wheal response to intradermal histamine, psychomotor effects, and serum concentrations of each drug were measured for 36 hours after each dose. The CNS effects were measured using critical flash-fusion frequency tests and Stroop word testing. Perceived feelings of drowsiness were measured using a visual analogue scale (VAS). In the second study, 15 healthy subjects received single oral doses of diphenhydramine 50 mg, cetirizine 5 mg, 10 mg, and 20 mg, and placebo in a double-blind, five-way crossover study. Skin-wheal response to intradermal histamine, psychomotor effects, and serum concentrations of each drug were measured for 24 hours after each dose. The CNS effects were measured using digit-symbol substitution testing. "Trails-B" maze tracking, and an analyzer of driving performance that assessed reaction time and vigilance.(ABSTRACT TRUNCATED AT 250 WORDS)

Automobile Driving↗