Driver Alert is based on a computerized wristband(表带). The device，worn by drivers or pilots，gives out a sound about every four minutes during the journey. After each sound the driver must respond by squeezing the steering wheel(方向盘). A sensor in the wristband detects this pressing action and measures the time between the sound and the driver’s response. Tiredness is directly related to a driver’s response time. Usually，a watchful driver would take about 400 milliseconds to respond，but once that falls to more than 500 milliseconds，it suggests that the driver is getting sleepy.

　　In such cases the device gives out more regular and louder sounds，showing that the driver should open a window or stop for a rest. If the driver’s response continues to slow down，the sounds become more frequent until a nonstop alarm warns that the driver must stop as soon as possible.

　　The device has been delivered to the department’s laboratories for testing. If these tests, scheduled for six months’ time，are successful，the markets will bring the product to market within about a year.

　　Title: __29__

　　　Ⅰ.__30__：

　　·To reduce __31__ accidents.

　　　Ⅱ.Working principle:

　　· (the device) based on __32__

　　· (the device) giving out a sound __33__

　　· (the driver) __34__ by squeezing the steering wheel

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