4辆无人驾驶的电动面包车完成了史上最长的无人驾驶旅程。
Four driverless electric vans have completed the longest-ever trip by an unmanned vehicle.
兰德公司的研究人员还指出，无人驾驶行业有必要开发其它的测试方法，以检验无人驾驶汽车是否真的比有人驾驶汽车安全。
The RAND researchers say that industry needs to develop other ways to examine whether self-driving vehicles are safer than those piloted by humans.
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