Hospital admission rates per million hours travel (mhua) by travel mode, age, and sex, England 2007–2009.

amhu: million hours use, estimated using National Travel Survey average speed for all trips by this mode as not available by age and sex.bThese averages include both local roads and motorways/multi-lane divided roadways, where fatality rates are an order of magnitude lower than general purpose roads, but data are not available by age and sex.cThis figure is greatly exaggerated by under-measurement of under-aged driving.dThese figures are too high as V19.8 is a dustbin code, including some off-highway falls.eEstimates are too low, as some ‘unspecified location’ deaths will have been on-highway.

a. amhu：百万小时使用量，该数据通过全国出行调查（National Travel Survey）中该出行方式的所有行程平均速度估算得出，因按年龄与性别细分的相关数据无法获取。b. 该平均速度涵盖了普通道路与高速公路/多车道分隔式道路两类通行场景，后者的死亡率较普通道路低一个数量级，但同样无法获取按年龄和性别细分的对应数据。c. 由于对未成年驾驶行为的统计不足，该数值被大幅高估。d. 上述数值偏高，原因在于V19.8属于垃圾编码，包含了部分非公路跌落事故的数据。e. 本次估算值偏低，因为部分标注为“地点不明”的死亡案例实际发生在公路上。