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Additional signal heads allow drivers to anticipate signal changes <br />farther away from intersections. Supplemental traffic signals may <br />be placed on the near side of an intersection, far-left, far-right, or <br />very high. <br />Cost $$ <br />LRSM ID S02 <br />SIGNALS <br />Increase <br />Attentiveness <br />and Awareness <br />SAFE SYSTEM HIERARCHY <br />Supplemental Signal Heads <br />Tier 1 Tier 2 Tier 3 Tier 4 <br />Other Reference Information <br />FHWA Manual for Selecting Safety Improvements on High Risk Rural Roads <br />The Advanced Dilemma-Zone Detection system adjusts the start <br />time of the yellow-signal phase (i.e. earlier or later) based on <br />observed vehicle locations and speeds. The Advanced Dilemma- <br />Zone Detection system minimizes the number of drivers that <br />are faced with the dilemma of determining if they should stop at <br />the intersection or drive through the intersection based on their <br />speed and distance from the intersection. <br />Cost $$ <br />LRSM ID S04 <br />SIGNALS <br />Manage Conflicts <br />in Time <br />SAFE SYSTEM HIERARCHY <br />Advanced Dilemma <br />Zone Detection <br />Tier 1 Tier 2 Tier 3 Tier 4 <br />Supplemental Signal Heads <br />Advanced Dilemma Zone Detection <br />38 Appendix J: Countermeasures Toolbox | Snoqualmie Pass Comprehensive Safety Plan | Kittitas County