APPENDIX E Decision Making Treatment Matrix – WINTER TREATMENT SPREAD RATE MATRIX SCOTS WINTER SERVICE SUBGROUP ADVICE - JULY 2015 Variation of Well Maintained Highways Appendix H - September 2013 Column C Column D Column G Column H Column K Column L Precautionary Good Salt Poor Cover Treatment for Poor Cover Cover Type medium Fair Cover Good Cover frost / ice medium Fair Cover medium medium Traffic medium Traffic medium Traffic Traffic High Traffic High Loss Traffic Normal Normal Loss High Loss Loss Normal Loss Loss RST at or Dry Salt 10(8) 10(8) 10(8) 10(8) 10(8) 10(8) above -2 Degrees and damp road conditions Table H9 of Pre-wet Code - where 10(8) 10(8) 10(8) 10(8) 10(8) 10(8) Salt the road surface is dry no action is needed even when Treated conditions are 10(7) 10(7) 10(7) 10(7) 10(7) 10(7) Salt below zero 15(13) Dry Salt 20(16) 10 or 15(11) 15(13) 10(8) 10 RST at or above -2 Pre-wet Degrees and 15(12) 15(14) 10(10) 15(12) 10(8) 10(9) Salt wet road conditions Treated 10(10) 10 or 15(11) 10(8) 10(10) 10(7) 10(7) Salt
APPENDIX E – Decision Making Treatment Matrix WINTER TREATMENT SPREAD RATE MATRIX SCOTS WINTER SERVICE SUBGROUP ADVICE - JULY 2015 Salt Type Precautionary Treatment for frost / ice Variation of Well Maintained Highways Appendix H - September 2013 Column C Column D Column G Column H Column K Column L Poor Cover medium Traffic Normal Loss Poor Cover medium Traffic High Loss Fair Cover medium Traffic Normal Loss Fair Cover medium Traffic High Loss Good Cover medium Traffic Normal Loss Good Cover medium Traffic High Loss Dry Salt RST at or above -2 Degrees and damp road conditions Table H9 of Code - where the road surface is dry no action is needed even when conditions are below zero 10(8) 10(8) 10(8) 10(8) 10(8) 10(8) Pre-wet Salt 10(8) 10(8) 10(8) 10(8) 10(8) 10(8) Treated Salt 10(7) 10(7) 10(7) 10(7) 10(7) 10(7) Dry Salt RST at or above -2 Degrees and wet road conditions 15(13) 20(16) 10 or 15(11) 15(13) 10(8) 10 Pre-wet Salt 15(12) 15(14) 10(10) 15(12) 10(8) 10(9) Treated Salt 10(10) 10 or 15(11) 10(8) 10(10) 10(7) 10(7)
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