Self-driving cars（自动驾驶）are believed to be the future of driving.Many companies are competing to be the first to bring them to market.
   However，carmakers need to s（1）

olve

olve

one problem first：How driverless cars communicate with passers-by（行人），bikers and other drivers？
   Most drivers today use gestures to show their p（2）

urposes

urposes

.They wave a car into a lane （车道），or nod at passers-by and cyclists，to let them c（3）

ross

ross

the street.But self-driving cars don't have this ability.What can they do？US maker Ford and its partner Virginia Tech（弗吉尼亚理工学院）think they have the answer.
   The team is testing a method that use l（4）

ights

ights

to show what self-driving cars are doing.For e（5）

xample

xample

，if a driverless car is yielding（让路），it can flash two white lights side to side.A white light tells there are no humans in the car.A slow blinking light shows the car is coming to a stop.A rapidly flashing light tells passers-by that the car is about to speed up.
   To test the method on r（6）

eal

eal

roads，the team designed a special suit that looks exactly like a car seat.When a driver wears it，it appears to people that the car is really driverless.
   The team then successfully got more than 1，500 hours of data（数据）after a（7）

bout

bout

2，900 kilometers of "self-driving" through busy cities.The data r（8）

ecorded

ecorded

how people interacted with a driverless car.
   Ford says they plan to s（9）

hare

hare

the data with 11 other companies.The company wants to work with other carmakers to design a signaling system that would be understood b（10）

y

y

all the people.