Virtual Driver

Driving involvessharp eyes and keen ears,analyzing with a brain,and coordination betweenhands,feet and brain.A man has sharp eyes and keen ears,analyzes through his

brain,and maintainscoordination between his hands and brains.He can control a fast-moving car withdifferent parts of his body._______(46)Apparently there isn't anyone in

the driver's cab,butthere is in fact a virtual driver. This virtual driver has eyes,brains,handsand feet too.The minicameras on each side of the car are its eyes and are

responsible forobserving the road conditions ahead of it as well as the traffic to its leftand right.If you open the boot,you can see the most important part of theautomatic

driving system.abuilt-in computer._______(47)The brain is responsible for calculating thespeeds objects surrounding the car are moving at,analyzing their position onthe

road, choosing theright path,and giving orders to the wheel and the control system.

In comparison withthe human brain,the virtual driver's best advantage is that it reacts quickly._______(48)However,it takes the world's best racecar driver at least one

second to react,andthis doesn't include the time he needs to take action.

With its rapidreaction and accurate control,the virtual driver can reduce the accident rateon expressways considerably.In this case,is it possible for us to let it havethe wheel

at any time and inany place?_______(49)With its limited ability to recognize things,the car cannow only travel on expressways.

The intelligent cardetermines its direction by the clear lines that mark the lanes clearly andrecognizes vehicles according to their regular shapes._______(50)This being the

case,people stillhave high hopes about driverless cars,and think highly intelligent cars arewhat the cars of the future should be like.________（48）

A.Experts say thatwe cannot do that just yet.

B.In the nearfuture,intelligent cars will be put into commercial operation.

C.This is the brainof the car.

D.But how does anintelligent car control itself?

E.It completes theprocessing of the images sent by the cameras within 100 milliseconds.