Partially automated vehicle technology is increasingly common on-road. While this technology can provide safety benefits to drivers, it also introduces new concerns about driver attention. In particular, during partially automated driving (PAD), drivers are expected to stay vigilant so they can readily respond to important events in their environment. However, using partially automated vehicles on the highway places drivers in monotonous situations and requires them to do very little. This can place the driver in a state of cognitive underload in which they experience a very small amount of cognitive demand. In this situation, drivers can exhibit vigilance decrements which impact their ability to respond to on-road threats. This is of particular concern in situations when the partially automated vehicle fails to respond to a potentially critical situation and leaves all responsibility to safely navigate to the driver. This paper reviews situations that lead to vigilance decrements and characterizes the different methodologies of measuring driver vigilance during PAD, highlighting their advantages and limitations. Based on our reading of the literature, we summarize several factors future research on vigilance decrements in PAD should consider.

半自动车辆技术在道路上越来越普遍。尽管该技术可以为驾驶员带来安全益处，但它也带来了有关驾驶员注意的新问题。特别是，在部分自动驾驶（PAD）期间，驾驶员应保持警惕，以便他们可以轻松应对周围环境中的重要事件。但是，在高速公路上使用部分自动驾驶的车辆会使驾驶员处于单调状态，并且要求他们做的很少。这会使驾驶员处于认知不足的状态，在这种情况下，他们会经历非常少量的认知需求。在这种情况下，驾驶员可能会表现出警惕性下降，从而影响其对道路威胁做出反应的能力。在部分自动驾驶的车辆无法应对潜在的紧急情况并让所有责任安全地导航到驾驶员的情况下，这一点尤为重要。本文回顾了导致警惕性降低的情况，并描述了在PAD期间测量驾驶员警惕性的不同方法，突出了它们的优点和局限性。在阅读文献的基础上，我们总结了PAD警惕性下降的未来研究应考虑的几个因素。