Agència de Salut Pública de Barcelona, Barcelona, Spain.
Inj Prev. 2010 Feb;16(1):12-6. doi: 10.1136/ip.2008.021485.
To assess the effectiveness of speed cameras in reducing the numbers of crashes and people injured on the arterial roads of Barcelona, and to assess their long-term effectiveness on the beltway.
Time series analyses were performed separately for the arterial roads and the beltway. The stretches of arterial roads encompassing 500 m before and after the location of a speed camera were considered the enforced stretches, the remaining stretches of arterial roads being considered the comparison group. The outcome measures were the numbers of crashes and of people injured. Quasi-Poisson regression models were fitted, controlling for time trend, seasonality and implementation of other road safety measures.
Both on the enforced and non-enforced arterial road stretches, the risks of crashes and people injured were similar in the two periods. On the beltway, reductions of 30% (95% CI 38% to 20%) and 26% (95% CI 36% to 14%) were observed, respectively.
Speed cameras do not reduce the numbers of crashes or people injured on the arterial roads of Barcelona. However, they are effective in the short and in the long-term on the beltway. Speed enforcement through fixed speed cameras is thus effective in medium-high-speed roads, although effectiveness could not be generalised to roads with lower speed limits and traffic lights.
评估速度相机在减少巴塞罗那动脉道路上的事故数量和受伤人数方面的有效性，并评估其在环城公路上的长期效果。
分别对动脉道路和环城公路进行时间序列分析。将包含速度相机位置前后 500 米的动脉道路段视为强制路段，其余动脉道路段视为对照组。结果测量为事故数量和受伤人数。控制时间趋势、季节性和实施其他道路安全措施，拟合准泊松回归模型。
在强制和非强制的动脉道路段上，两段时间的事故和受伤风险相似。在环城公路上，分别观察到 30%（95%置信区间 38%至 20%）和 26%（95%置信区间 36%至 14%）的降幅。
速度相机不会减少巴塞罗那动脉道路上的事故或受伤人数。然而，它们在环城公路上短期和长期都有效。通过固定速度相机进行速度执法在中高速道路上是有效的，尽管效果不能推广到限速和有交通灯的道路。
