Rear-end crash is the predominant crash type in work zones. This study employs a random parameters logit approach with heterogeneity in means and variances to investigate factors affecting the injury severity of rear-end crashes in work zones using the data collected in North Carolina. The injury severity is divided into three categories (i.e., injury, possible injury, and property damage only). The relationships between the severity outcomes and drivers’, environmental, roadway, work zone, and crash characteristics are explored. Likelihood ratio tests are conducted to examine the temporal stability of estimation results between different time periods. A significant temporal instability is found between 2010 and 11 and 2012–13. A comparison of the marginal effects using different approaches is performed as well. Compared with the random parameters logit model only, the random parameters logit approach with heterogeneity in means and variances produces the best fitting results.

后端碰撞是工作区域中的主要碰撞类型。这项研究采用随机参数对数方法，均值和方差具有异质性，使用北卡罗来纳州收集的数据调查影响工作区追尾事故伤害严重性的因素。伤害严重程度分为三类（即，伤害，仅可能的伤害和仅财产损失）。探索了严重性结果与驾驶员，环境，道路，工作区和碰撞特征之间的关系。进行似然比测试以检查不同时间段之间估计结果的时间稳定性。在2010年与11年以及2012-13年之间发现了明显的时间不稳定。还使用不同的方法对边际效应进行了比较。