日本从本周二起，将所有无中心线的狭窄城市住宅道路的限速从60公里/小时下调至30公里/小时。1 这一措施覆盖约87万公里道路，占日本普通道路总数的70%左右。1 该举措旨在降低行人伤亡，特别是保护儿童和老年人的安全。1
根据警方数据，速度与行人死亡率存在显著关联。1 在30公里/小时以下速度发生的交通事故中，行人死亡率低于1%，但当速度提升至30至40公里/小时时上升至2.7%，在50至60公里/小时时则高达17.4%。1 儿童和老年人在住宅道路交通事故中的伤亡人数自2021年以来保持在每年约300人左右，但在2025年首次出现上升。1
日本曾在2011年推出有限的"30区域"试点措施，取得了显著成效。1 该试点项目使相关区域的伤亡数减少了30%。1
Japan implemented a nationwide reduction of speed limits on Tuesday, lowering the maximum permitted speed from 60km/h to 30km/h on all narrow residential roads without center markings.1 The measure applies to approximately 870,000 kilometers of roadways less than 5.5 meters wide, which represent roughly 70 percent of Japan's ordinary roads.1
The policy shift aims to address rising pedestrian fatalities among vulnerable groups. Deaths and injuries involving children and elderly people on residential roads had remained around 300 annually since 2021, but 2025 marked the first year this figure increased.1 According to police data, the speed reduction is grounded in evidence showing that pedestrian fatality rates drop below 1 percent in accidents occurring at speeds of 30km/h or lower, compared to 2.7 percent at 30-40km/h and 17.4 percent at 50-60km/h.1
Police Commissioner Yoshinobu Kusunoki stated: "We ask drivers to recognise that they need to take particular care on roads shared by vehicles, pedestrians and cyclists."1 The new regulation builds on the success of a limited initiative launched in 2011, which established "zone 30" areas that achieved a 30 percent reduction in casualties.1
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