the average delay per vehicle
the average delay per vehicle
每辆车的平均延误时间
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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In the year ending December 2010, the provisional figure for average vehicle delay on the slowest 10% of journeys was 3.55 minutes per 10 miles, a fall of 9% since March 2008.
BBC: How are motorists saving fuel?