Google last year demonstrated the results of its research-and-development efforts to create an autonomous vehicle. The small fleet of specially equipped cars- six Toyota Priuses and one Audi TT- has logged more than 140,000 miles of daytime and nighttime driving in California, including traversing San Francisco's famously crooked Lomhard Street and the Los Angeles freeways (Figure 1). In all cases, an engineer was in the driver's seat, monitoring each car's performance and ready to take over if necessary.
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