Abstract
To decrease un-safe cut in of kindergarten bus to the traffic, we evaluated stress during driving and other mental and physical factors which adversely influences driver’s driving performance, cognition and decision making etc. by the 24 hour’s measurement with M-BIT.For bus drivers, the most stressful situation was turning to move to the standby position in narrow and crowded kindergarten’s parking lot, in this case. And this stress caused “un safe cut in” of kindergarten bus. To reduce these, structured parking in the parking lot and effective cooperation of bus drivers and attendant teachers had started. These efforts may decrease drivers stress, and thus, improve the safety of kindergarten bus. Other risky-factors for driving, the occurrence of arrhythmia due to driving, and frequent occurrence of apnea during sleeping were also detected.