This study evaluated safety effects associated with converting traditional stop control (TSC) to all-way stop control (AWSC) at 53 intersections in Washington, DC. The study utilized an observational treatment group and a randomly selected comparison group. Negative binomial regression modeling was used to estimate the effect of AWSC conversion on crash outcomes, control for confounding factors, and check its statistical significance. The study also examined potential covariates that could influence AWSC crash outcomes, such as the number of legs of the intersection and the functional classification of the intersecting roads. This study found an overall 36% reduction in all crashes and a 42% reduction in injury crashes associated with converting intersections from TSC to AWSC. In addition, the study revealed a statistically significant reduction in right-angle crashes along with a statistically significant increase in straight hit pedestrian crashes. For all the other collision types, including right turn, left turn, rear-end, sideswipes, and bicycle crashes, no statistically significant coefficients were found. With many “Vision Zero” cities considering increased use of AWSC to help achieve their safety goals, it is important to understand and communicate the safety effects of AWSC.

这项研究评估了华盛顿特区53个交叉路口将传统停车控制（TSC）转换为全向停车控制（AWSC）的安全效果。该研究采用观察治疗组和随机选择的比较组。负二项式回归模型用于估计AWSC转换对碰撞结果的影响，控制混杂因素并检查其统计意义。该研究还检查了可能影响AWSC碰撞结果的潜在协变量，例如交叉路口的支路数和相交道路的功能分类。这项研究发现，与将交叉路口从TSC转换为AWSC相比，所有碰撞的总体减少了36％，伤害事故的减少了42％。此外，研究表明，直角碰撞的统计显着减少，直撞行人碰撞的统计显着增加。对于所有其他碰撞类型，包括右转弯，左转弯，追尾，侧滑和自行车撞车，均未发现统计上显着的系数。随着许多“零视力”城市考虑增加使用AWSC来帮助实现其安全目标，了解和传达AWSC的安全影响非常重要。