Maintenance Decision Support System GIS Display of Jurisdiction

GIS Display of Jurisdiction Area • Intersection I-15 and I-70 in Utah • Point

Two-Day Precipitation Rate History Prediction Point #3 0. 40 Precipitation Rate (SWE) (in/hr) 0.

Two-Day Temperature History Prediction Point #3 40 35 Air Temperature Pavement Temperature (deg F)

Two-Day Snow Depth History Without Treatment Prediction Point #3 16 14 Snow Depth with

Two-Day Chemical Concentration History Without Treatment Prediction Point #3 25 Concentration of Na. Cl

Two-Day Friction Coefficient History Without Treatment Prediction Point #3 1 Friction Coefficient with No

Decisions Supported by MDSS 2. 1 become aware of weather threat 2. 2 monitor

Decisions Supported by MDSS 2. 21 select treatment expendables 2. 5 replenish consumable stocks

Decisions Supported by MDSS 2. 24 dispatch crews to wait at routes 2. 27

Decisions Supported by MDSS 2. 29 dispatch crews to treat (bulk removal) 2. 31

Pre-Defined Levels Of Service ● DOT road classifications based on number of vehicles/day ●

Maine DOT Application Rate Matrix Current Pavement Temperature (F) Above 32 25 to 32

Two-Day Decision Support History Recommended Treatments Prediction Point #3 0. 40 Precipitation Rate (SWE)

Two-Day Snow Depth History With and Without Treatment Prediction Point #3 16 14 Snow

Two-Day Chemical Concentration History With and Without Treatment Prediction Point #3 25 Concentration of

Two-Day Friction Coefficient History With and Without Treatment Prediction Point #3 1 Friction Coefficient

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Maintenance Decision Support System

GIS Display of Jurisdiction Area • Intersection I-15 and I-70 in Utah • Point intervals along corridor ranging from 1 to 3 miles

Two-Day Precipitation Rate History Prediction Point #3 0. 40 Precipitation Rate (SWE) (in/hr) 0. 35 0. 30 0. 25 0. 20 0. 15 0. 10 0. 05 Rain Mixed Snow 0. 00 0 Midnight Tuesday 3 6 9 12 15 18 21 24 27 30 33 Midnight Wednesday Time Since Awareness (hrs) 36 39 42 45 48 Midnight Thursday

Two-Day Temperature History Prediction Point #3 40 35 Air Temperature Pavement Temperature (deg F) 30 25 20 15 10 5 0 0 Midnight Tuesday 3 6 9 12 15 18 21 24 27 30 33 Midnight Wednesday Time Since Awareness (hrs) 36 39 42 45 48 Midnight Thursday

Two-Day Snow Depth History Without Treatment Prediction Point #3 16 14 Snow Depth with No Maintenance Efforts Snow Depth (in) 12 10 8 6 4 2 0 0 Midnight Tuesday 3 6 9 12 15 18 21 24 27 30 33 Midnight Wednesday Time Since Awareness (hrs) 36 39 42 45 48 Midnight Thursday

Two-Day Chemical Concentration History Without Treatment Prediction Point #3 25 Concentration of Na. Cl (no treatment) Concentration (% by weight) 20 15 10 5 0 0 Midnight Tuesday 3 6 9 12 15 18 21 24 27 30 33 Midnight Wednesday Time Since Awareness (hrs) 36 39 42 45 48 Midnight Thursday

Two-Day Friction Coefficient History Without Treatment Prediction Point #3 1 Friction Coefficient with No Maintenance Efforts 0. 9 Friction Coefficient 0. 8 0. 7 0. 6 0. 5 0. 4 0. 3 0. 2 0. 1 0 0 Midnight Tuesday 3 6 9 12 15 18 21 24 27 30 33 Midnight Wednesday Time Since Awareness (hrs) 36 39 42 45 48 Midnight Thursday

What ? When ? How ?

Decisions Supported by MDSS 2. 1 become aware of weather threat 2. 2 monitor weather threat 2. 3 identify weather threat occurance 2. 4 assess sufficiency of equip. & consumables 2. 6 check readiness of equip. & consumables 2. 10 assign minimum staff to monitor and manage 2. 13 disseminate important weather info to field staff 2. 14 forward-place equipment and stocks 2. 16 alert supervisory staff to monitor/prepare 2. 18 alert crews

Decisions Supported by MDSS 2. 21 select treatment expendables 2. 5 replenish consumable stocks 2. 7 mix expendables 2. 11 select event-treatment strategy 2. 17 confirm strategy-plan in place 2. 12 assign crews to shifts, schedules 2. 22 dress and load equipment 2. 19 split crew shifts 2. 25 dispatch crews to treat (anti-ice)

Decisions Supported by MDSS 2. 24 dispatch crews to wait at routes 2. 27 dispatch crews to treat (plow/spread) 2. 28 dispatch crews to treat (plow cake, de-ice) 2. 30 dispatch crews to treat (ice-spot treat) 2. 42 re-evaluate storm intensity and duration 2. 44 determine the LOS goal is reached 2. 39 close roads 2. 41 rest crews

Decisions Supported by MDSS 2. 29 dispatch crews to treat (bulk removal) 2. 31 dispatch crews to treat (drifting) 2. 47 dispatch crews to clean up 2. 43 identify threat end 2. 48 open roads

Pre-Defined Levels Of Service ● DOT road classifications based on number of vehicles/day ● Level of Service standards • • Bare Pavement • • • Full-width 50%-75% width Left-wheel Passing Lane None Time • 4, 6, 16, 24 hours after storm ends • Or as soon as practical and as weather permits ● “Provide reasonable traveling conditions for the prudent driver during storm, depending on location, time of day”

Maine DOT Application Rate Matrix Current Pavement Temperature (F) Above 32 25 to 32 20 to 25 15 to 20 Anticipated Pavement Temperature Change Precipitation Type* / Severity Salt Application Rate ** (lbs per two-lane mile) Comments Higher R, SL, WS / Light Lower R, SL, WS / Mod. - Heavy 100 to 200 Use Pre-Wet System Higher FR, SL, DS, WS / Light 200 to 300 Pre-Wet: 6 Gallons/Ton Higher FR, SL, DS, WS / Mod. – Heavy 200 to 300 Pre-Wet: 6 Gallons/Ton Lower FR, SL, DS, WS / Light 200 to 400 Pre-Wet: 6 Gallons/Ton Lower FR, SL, DS, WS / Mod. - Heavy 200 to 400 Pre-Wet: 6 Gallons/Ton Higher SL, DS, WS / Light 300 to 500 Pre-Wet: 8 Gallons/Ton Higher SL, DS, WS / Mod. – Heavy 300 to 500 Pre-Wet: 8 Gallons/Ton Lower SL, DS, WS / Light 400 to 600 Pre-Wet: 8 Gallons/Ton Lower SL, DS, WS / Mod. - Heavy 400 to 600 Pre-Wet: 8 Gallons/Ton Higher SL, DS / Light 500 to 700 Pre-Wet: 10 Gallons/Ton Higher SL, DS / Mod. – Heavy 500 to 700 Pre-Wet: 10 Gallons/Ton Lower SL, DS / Light 700 to 800 Pre-Wet: 10 Gallons/Ton Lower SL, DS / Mod. - Heavy 700 to 800 Pre-Wet: 10 Gallons/Ton No Salt. Apply Sand Monitor Pavement Temp. and Plow as Needed. Switch to Salt if Rising Above 15 or Below 15 F If snow is blowing off roadway and no hard-pack exists, do not apply chemicals or abrasives. * R=Rain, FR=Freezing Rain, SL=Sleet, WS=Wet Snow, DS=Dry Snow ** Initial application. Plow and re-apply salt at half-rate if surface becomes mealy or slushy, or full rate if glazed or packed.

Two-Day Decision Support History Recommended Treatments Prediction Point #3 0. 40 Precipitation Rate (SWE) (in/hr) 0. 35 Ideal Time For Chemical Application 0. 30 0. 25 Ideal Time For Plowing Effort 0. 20 0. 15 0. 10 0. 05 Rain Mixed Snow 0. 00 0 Midnight Tuesday 3 6 9 12 15 18 21 24 27 30 33 Midnight Wednesday Time Since Awareness (hrs) 36 39 42 45 48 Midnight Thursday

Two-Day Snow Depth History With and Without Treatment Prediction Point #3 16 14 Snow Depth with No Maintenance Efforts Snow Depth (in) 12 Snow Depth with Recommended Maintenance Efforts 10 8 6 4 2 0 0 Midnight Tuesday 3 6 9 12 15 18 21 24 27 30 33 Midnight Wednesday Time Since Awareness (hrs) 36 39 42 45 48 Midnight Thursday

Two-Day Chemical Concentration History With and Without Treatment Prediction Point #3 25 Concentration of Na. Cl (no treatment) Concentration of Na. Cl (with treatment) Concentration (% by weight) 20 15 10 5 0 0 Midnight Tuesday 3 6 9 12 15 18 21 24 27 30 33 Midnight Wednesday Time Since Awareness (hrs) 36 39 42 45 48 Midnight Thursday

Two-Day Friction Coefficient History With and Without Treatment Prediction Point #3 1 Friction Coefficient with No Maintenance Efforts 0. 9 Friction Coefficient with Recommended Maintenance Efforts Friction Coefficient 0. 8 0. 7 0. 6 0. 5 0. 4 LOS 1 0. 3 0. 2 0. 1 0 0 Midnight Tuesday 3 6 9 12 15 18 21 24 27 30 33 Midnight Wednesday Time Since Awareness (hrs) 36 39 42 45 48 Midnight Thursday

What A Tool !