For travelling or transportation we have many types of vehicles.

我们有许多种交通工具进行旅行或运输。

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However, the term automobile is far from precise, because there are many types of vehicles that do similar tasks.

然而，长期的汽车是远远准确，因为有许多类型的车辆，但类似的任务。

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These factors include time of day, congestion, weather, conditions of vehicles, types of vehicles on the roads, speed limits, and police patrols.

驾驶条件的因素：这些因素包括一天当中路面的驾驶时间、行车阻塞、天气、车况、车型、车速限制和交警巡逻等。

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However, as petrol and diesel engines are also improving, the relationships between the different types of vehicles are not constant.

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Their overall replacement values are greater and their repair costs tend to be more expensive than other types of vehicles.

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Google is the most visible company working on these types of vehicles, but similar projects are under way at other organizations, including Caltech.

CNN: Self-driving cars now legal in California