Lifelines can be especially helpful when miners must escape on foot in conditions of very low visibility (e.g. due to smoke or the absence of light). Conducting regular assessments of each miner's knowledge and skills with respect to lifelines should be a key component of miner safety training. The better prepared miners are to escape from the mine quickly, the better their ultimate chances of survival. Recent NIOSH research reveals several ways miners can be helped to improve their recognition of lifeline tactile signals. Lifelines with various tactile signals have been required by federal regulation 30 CFR Part 74.380 since 2009. There are now five types of tactile signals on lifelines: directional cones (which indicate the direction to go outby), a coil to indicate a refuge chamber, two sets of double cones to indicate a self-contained, self-rescuer (SCSR) cache, two directional cones in a row to indicate a branch line, and a ball to indicate a personnel door. These signals were instituted to provide an additional navigational tool to help miners escape in the event of an emergency.
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机译：当矿工必须在能见度很低的情况下（例如由于烟尘或光线不足）步行步行时，生命线特别有用。定期评估每个矿工在生命线方面的知识和技能，应是矿工安全培训的关键组成部分。做好充分准备的矿工要迅速从矿井中逃脱，最终生存的机会就越大。 NIOSH的最新研究揭示了可以帮助矿工改善对生命线触觉信号的识别的几种方法。自2009年以来，联邦法规30 CFR Part 74.380要求使用各种触觉信号的救生索。现在，救生索上有五种类型的触觉信号：定向锥体（指示外出方向），指示避难所的线圈，两种一组双圆锥体表示一个独立的，自救式（SCSR）缓存，连续两个方向圆锥体表示一个分支线，一个球表示一个人员门。设置这些信号是为了提供附加的导航工具，以帮助矿工在紧急情况下逃脱。
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