C．measures to punish road offences

　　D．increased awareness of road rules

　　解析：选A。主旨大意题。三封信都涉及了真正的“马路杀手”。第一封信认为是行人，第二、三封信认为是骑自行车的人。因此这三封信所表达的观点与马路危险的真正根源有关。

　　B

　　People in several American states may be surprised to see cars on city streets without a driver.Experimental driverless vehicles now are legal in Florida，Nevada and California.They are pointing the way to a future that is not far down the road.The high­tech company Google has a number of self­driving cars，which had covered 480,000 kilometers by August.Volvo is among the companies doing road tests and says it plans to sell driverless cars by 2020.

　　In September，California Governor Jerry Brown signed an act to allow autonomous vehicles on the roads of his state.“Today we’re looking at science fiction becoming tomorrow’s reality—the driverless car.” The technology for these cars includes cameras，radar and motion sensors.The systems have been improved through competitions sponsored by the U．S.government agency DARPA.Engineer Richard Mason of the Rand Corporation helped design driverless vehicles for DARPA

　　challenge races.

　　Cars have become much more fuel­efficient，and new electronic features are making Hondas safer，said Angie Nucci of Honda America.“A camera on the passenger­side mirror actually engaged on your guiding screen so you can safely change lanes.” Other safety features include warning systems on the front and the sides of the cars.These systems help drivers，but don’t replace them.Curator Leslie Kendall of the Petersen Automotive Museum said autonomous cars will make the high ways safer.

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