The number of road traffic accidents decreased in Lithuania from 2002 to 2017, while the ungulate–vehicle collision (UVC) number increased and accounted for approximately 69% of all wildlife–vehicle collisions (WVC) in the country. Understanding the relationship between UVCs, traffic intensity, and implemented mitigation measures is important for the assessment of UVC mitigation measure efficiency. We assessed the effect of annual average daily traffic (AADT) and wildlife fencing on UVCs using regression analysis of changes in annual UVCs and UVC hotspots on different categories of roads. At the highest rates, annual UVC numbers and UVC hotspots increased on lower category (national and regional) roads, forming a denser network. Lower rates of UVC increase occurred on higher category (main) roads, forming sparser road networks and characterized by the highest AADT. Before 2011, both UVC occurrence and fenced road sections were most common on higher-category roads. However, as of 2011, the majority of UVCs occurred on lower-category roads where AADT and fencing had no impact on UVCs. We conclude that wildlife fencing on roads characterized by higher speed and traffic intensity may decrease UVC numbers and at the same time shifting UVC occurrence towards roads characterized by lower speed and traffic intensity. Wildlife fencing re-allocates wildlife movement pathways toward roads with insufficient or no mitigation measures.

中文翻译：

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道路围栏对不规则车辆碰撞和热点模式的影响

从2002年到2017年，立陶宛的道路交通事故数量有所减少，而有蹄类动物-车辆碰撞（UVC）的数量有所增加，约占该国所有野生动植物-车辆碰撞（WVC）的69％。了解UVC，交通强度和已实施的缓解措施之间的关系对于评估UVC缓解措施的效率很重要。我们通过对不同类别道路上年度UVC和UVC热点变化的回归分析，评估了年平均日流量（AADT）和野生动物围栏对UVC的影响。在最高级别，较低类别（国家和地区）道路上的年度UVC数量和UVC热点增加，形成了一个更密集的网络。UVC增加率较低，发生在较高类别（主要）的道路上，形成稀疏的道路网络，并具有最高的AADT。在2011年之前，UVC发生和围栏路段在高等级道路上最为常见。但是，截至2011年，大部分UVC发生在AADT和围栏对UVC没有影响的低等级道路上。我们得出的结论是，在速度和交通强度较高的道路上围栏的野生动植物可能会减少UVC数量，同时将UVC发生转移到速度和交通强度较低的道路上。野生动物围栏将野生动物的运动路径重新分配到没有足够缓解措施或没有缓解措施的道路上。大多数UVC发生在AADT和围栏对UVC没有影响的低等级道路上。我们得出的结论是，在速度和交通强度较高的道路上围栏的野生动植物可能会减少UVC数量，同时将UVC发生转移到速度和交通强度较低的道路上。野生动物围栏将野生动物的运动路径重新分配到没有采取缓解措施或没有采取缓解措施的道路上。大多数UVC发生在AADT和围栏对UVC没有影响的低等级道路上。我们得出的结论是，在速度和交通强度较高的道路上围栏的野生动植物可能会减少UVC数量，同时将UVC发生转移到速度和交通强度较低的道路上。野生动物围栏将野生动物的运动路径重新分配到没有采取缓解措施或没有采取缓解措施的道路上。