Chart 1: Decision Tool for Selecting Various Types of Positive Protection Devices

This diagram is a decision tree to assist users in selecting the optimal positive protection device for a given work zone scenario. The decision tree functions by asking a series of questions. Depending on whether the answer is "yes" or "no," the user is advised either to use a particular form of positive protection device, or is asked further questions to narrow down the choices of which device to use. The contents of the decision tree are as follows:

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