Between June 2018 and December 2022, Tesla released quarterly safety reports citing average miles between crashes for Tesla vehicles. Prior to March 2021, crash rates were categorized as 1) with their SAE Level 2 automated driving system Autopilot engaged, 2) without Autopilot but with active safety features such as automatic emergency braking, and 3) without Autopilot and without active safety features. In January 2022, Tesla revised past reports to reflect their new categories of with and without Autopilot engaged, in addition to making small adjustments based on recently discovered double counting of reports and excluding previously recorded crashes that did not meet their thresholds of airbag or active safety restraint activation. The revisions are heavily biased towards no-active-safety-features$\unicode{x2014}$a surprising result given prior research showing that drivers predominantly keep most active safety features enabled. As Tesla's safety reports represent the only national source of Level 2 advanced driver assistance system crash rates, clarification of their methods is essential for researchers and regulators. This note describes the changes and considers possible explanations for the discrepancies.

翻译：2018年6月至2022年12月期间，特斯拉发布了季度安全报告，引用了特斯拉车辆的平均行驶里程间隔碰撞数据。在2021年3月之前，碰撞率被分类为：1）启用其SAE 2级自动驾驶系统Autopilot时；2）未启用Autopilot但启用自动紧急制动等主动安全功能时；3）未启用Autopilot且未启用主动安全功能时。2022年1月，特斯拉修订了过往报告以反映其新的分类标准（启用与未启用Autopilot），同时基于近期发现的报告重复计数问题进行了小幅调整，并排除了先前记录的未达到安全气囊或主动安全约束装置启动阈值的事故。修订结果明显偏向于未启用主动安全功能的情况——考虑到先前研究表明驾驶员主要保持大多数主动安全功能处于启用状态，这一结果令人意外。由于特斯拉的安全报告是唯一全国性的2级先进驾驶辅助系统碰撞率数据来源，对其方法进行澄清对研究者和监管机构至关重要。本文描述了这些变更，并对数据差异的可能解释进行了探讨。