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Vibration is both a source of discomfort and a possible risk to human health. There have been numerous studies and knowledge exists regarding the vibrational behavior of vehicle seats on adult human occupants. Children are more and more becoming regular passengers in the vehicle. However, very little knowledge available regarding the vibrational behavior of child safety seats for children. Therefore, the objective of this study was to measure the vibrations in three different baby car seats and to compare these to the vibrations at the interface between the driver and the automobile seat. The test was performed on the National road at the average speed of 70 km/h and acceleration levels were recorded for about 350 Sec (5.83 min). One male driver considered as an adult occupant and a dummy having a mass of 9 kg was representing one year old baby. Four accelerometers were used to measure the vibration. All measured accelerations were relative to the vertical direction.

In this study, we analyzed the physiological characteristics of elderly drivers when they met an unexpected event like a sudden stop by the car in front or cut in lane while driving on the highway. Electroencephalogram (EEG), electrocardiogram (ECG), Galvanic skin response (GSR), and skin temperature (SKT) were measured and analyzed from drivers during driving using a driving simulator. In this experiment, 20 elderly people (males, 65.6±5.0 years old) who have driving experience more than 10 years participated. As a control group, twenty young male adults (26.3±2.0 years old) in twenties whose driving experience was over 3 years. All subjects performed practice driving about for 10 min to adapt to the driving simulator before the main test. Driving speeds given to subjects were 50, 70, 90, 110 km/h. Unexpected events were repeated twice. As a result, compared with young drivers, elderly drivers showed longer and greater cognitive strain while driving simulator.