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 warms 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 markers will bring the product to market within about a year．

　　1．According to the text，Driver Alert ______．

　　A．aims to reduce tiredness-related accidents

　　B．has gone through testing at laboratories

　　C．aims to prevent drivers from sleeping

　　D．has been on sale for 12 months

　　2．How should a driver respond to the sounds from Driver Alert？

　　A．By sounding a warning

　　B．By touching the wristband

　　C．By checking the driving time

　　D．By pressing the steering wheel

　　3．We can learn from the text that the driver needs to stop for a break when his  response time is   ______．

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