Reductions of speed limits for road traffic are effective in reducing casualties, and are also increasingly promoted as an effective way to reduce noise exposure.

The aim of this study was to estimate the health benefits of the implementation of 30 km/h speed limits in the city of Lausanne (136′077 inhabitants) under different scenarios addressing exposure to noise and road crashes.

The study followed a standard methodology for quantitative health impact assessments to derive the number of attributable cases in relation to relevant outcomes. We compared a reference scenario (without any 30 km/h speed limits) to the current situation with partial speed limits and additional scenarios with further implementation of 30 km/h speed limits, including a whole city scenario.

Compared to the reference scenario, noise reduction due to the current speed limit situation was estimated to annually prevent 1 cardiovascular death, 72 hospital admissions from cardiovascular disease, 17 incident diabetes cases, 1′127 individuals being highly annoyed and 918 individuals reporting sleep disturbances from noise. Health benefits from a reduction in road traffic crashes were less pronounced (1 severe injury and 4 minor injuries). The whole city speed reduction scenario more than doubled the annual benefits, and was the only scenario that contributed to a reduction in mortality from road traffic crashes (one death per two years). Implementing 30 km/h speed limits in a city yields health benefits due to reduction in road traffic crashes and noise exposure. We found that the benefit from noise reduction was more relevant than safety benefits.

降低道路交通速度限制可以有效地减少人员伤亡，并且也越来越多地被推荐作为减少噪音暴露的有效方法。

这项研究的目的是评估在洛桑市（136'077居民）在暴露于噪音和交通事故的不同情况下实施30 km / h时速限制所带来的健康益处。

这项研究遵循了定量健康影响评估的标准方法，以得出与相关结果相关的可归因病例数。我们将参考情景（没有任何30 km / h的速度限制）与具有局部速度限制的当前状况和其他情景以及进一步实施30 km / h的速度限制（包括整个城市情景）进行了比较。

与参考情景相比，据估计，由于当前限速情况而导致的噪音降低，每年可预防1例心血管死亡，72例因心血管疾病住院，17例糖尿病发病，1'127个人被高度烦恼和918个人报告来自噪声。减少道路交通事故对健康的好处不太明显（1起重伤和4起轻伤）。整个城市降低速度的方案使年度收益增加了一倍以上，并且是唯一一种降低道路交通事故死亡率（每两年死亡1人）的方案。由于减少了道路交通事故和噪音暴露，在城市中实施30 km / h的速度限制会带来健康益处。