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Concept of Studying Rules 16.1, Restrictions Can affect Authory Protection Governance 6.21, Restrictions Can affect Authory Protection Governance Rule 6.20, Protection 1.47 Means Track conditions and trains and engines, Single selected speed Can be Signal, Mandatory Directives 2.14 Can affect Authory Protection Governance Rule 6.20, Restrictions Can affect Authory Protection Governance 5.4.2B 5.4.3, TTSI Leads to Sign 16.0, Governance 6.31 May lead to Signal, Mandatory Directives 2.14 Can affect Authory Protection Governance 9.5, Governance 6.31 May lead to Voice