# Presentation: 056150

## 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**

**GIS Display of Jurisdiction Area**

## Slide 3

## Slide 4

## Slide 5

## Slide 6

## Two-Day Friction Coefficient History

**Two-Day Friction Coefficient History**
***Without Treatment***
**Prediction Point #3**

**Friction Coefficient**

**3**

**6**

**9**

**12**

**15**

**18**

**21**

**24**

**27**

**30**

**33**

**36**

**39**

**42**

**45**

**48**

**Time Since Awareness (hrs)**

**0**

**0**

**0.1**

**0.2**

**0.3**

**0.4**

**0.5**

**0.6**

**0.7**

**0.8**

**0.9**

**1**

## What ? 

- 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

- Anticipated Pavement Temperature Change

- Precipitation
- Type* / Severity

-     Salt Application Rate **
- (lbs per two-lane mile)

- Comments

- Above 32

- 25 to 32

- 20 to 25

- 15 to 20

- 15 or Below

- Higher
- Lower

- Higher
- Higher
- Lower
- Lower

- Higher
- Higher
- Lower
- Lower

- Higher
- Higher
- Lower
- Lower

- R, SL, WS / Light
- R, SL, WS / Mod. - Heavy

- FR, SL, DS, WS / Light
- FR, SL, DS, WS / Mod. – Heavy
- FR, SL, DS, WS / Light
- FR, SL, DS, WS / Mod. - Heavy

- SL, DS, WS / Light
- SL, DS, WS / Mod. – Heavy
- SL, DS, WS / Light
- SL, DS, WS / Mod. - Heavy

- SL, DS / Light
- SL, DS / Mod. – Heavy
- SL, DS / Light
- SL, DS / Mod. - Heavy

- 100 to 200

- 200 to 300
- 200 to 300
- 200 to 400
- 200 to 400

- 300 to 500
- 300 to 500
- 400 to 600
- 400 to 600

- 500 to 700
- 500 to 700
- 700 to 800
- 700 to 800

- No Salt.  Apply Sand
- and Plow as Needed.

- Use Pre-Wet System

- Pre-Wet: 6 Gallons/Ton
- Pre-Wet: 6 Gallons/Ton
- Pre-Wet: 6 Gallons/Ton
- Pre-Wet: 6 Gallons/Ton

- Pre-Wet: 8 Gallons/Ton
- Pre-Wet: 8 Gallons/Ton
- Pre-Wet: 8 Gallons/Ton
- Pre-Wet: 8 Gallons/Ton

- Pre-Wet: 10 Gallons/Ton
- Pre-Wet: 10 Gallons/Ton
- Pre-Wet: 10 Gallons/Ton
- Pre-Wet: 10 Gallons/Ton

- Monitor Pavement Temp.
- Switch to Salt if Rising Above 15F

- *  R=Rain, FR=Freezing Rain, SL=Sleet, WS=Wet Snow, DS=Dry Snow

- If snow is blowing off roadway and no hard-pack exists, do not apply chemicals or abrasives.

- **  Initial application.  Plow and re-apply salt at half-rate if surface becomes mealy or slushy, or full rate if glazed or packed.

## Slide 15

## Slide 16

## Slide 17

## Slide 18

## Two-Day Friction Coefficient History

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

**Friction Coefficient**

**3**

**6**

**9**

**12**

**15**

**18**

**21**

**24**

**27**

**30**

**33**

**36**

**39**

**42**

**45**

**48**

**Time Since Awareness (hrs)**

**0**

**0**

**0.1**

**0.2**

**0.3**

**0.4**

**0.5**

**0.6**

**0.7**

**0.8**

**0.9**

**1**

## What A Tool !