2007-2008 Snow and Ice Report

1. 2007-2008 Snow and Ice Report Mn/DOT Operations Division Meeting June 2008

11. Maintenance: Snow & Ice Removal Hours to Bare Lane -

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30. Notes: Jeff Butson

32. New Measure - Bare Lane Frequency

34. Iowa Analysis of Winter Severity Index • Looked at data from 2000 to 2005. • Winter weather can only explain about 6% of variance in expenditures from one area to another (district to district). • WSI is not good when comparing area to area, other really important factors influencing costs must be controlled. • WSI is a good comparison by area (year to year) because those important factors are held constant. • 70% of variance is ADT, service miles, service level and weather. 30% of variance is area culture. • Weather has little to do with cost variances. • Some areas use more or less labor, materials and equipment.

45. Snow and Ice Wrap Up Meeting Highlights • D1 – Winter Operations Central Coordinator, Developed Post Storm Summary and increasing use of Magnesium Chloride • D2 – Central Dispatcher to coordinate Subareas and State Patrol - went well (used one instead of two), AVL/MDSS, using maintenance workers to calibrate sanders (not mechanics) • D3 – Increase use of LCS (Liquid Corn Salt), Tow Plow, Tanker for anti icing ramps and decks, increased brine • D4 – Success with chutes, WRMS project success => program failed, continue using dye, LCS also • D6 – Green instead of purple (dye), Added more Dawn Patrol, continued focus on salt reduction (10 % goal), S/I maps extremely effective, Tested Super Saturated (Slurry) Salt Applications – very good results

46. Snow and Ice Wrap Up Meeting Highlights • D7 - Two tankers for anti-icing, seasonal re-assignment of some non maintenance personnel, S/I maps worked well, LCS – not so thrilled • D8 – using more Magnesium Chloride, Post Storm Meetings, S/I maps – not so good • Metro – Tow plow, zero velocity spreader looks promising, rubber cutting edge – wing yes, front no, “Joma” blade – steel encased in rubber

47. Snow and Ice Wrap Up – Improvement Areas • Snow and Ice mapping continues to problematic for some district. CO maintenance will meet in each district that request help. • Saw some lapses in forecasting – RWIS gaps? Easier to forecast wind that precipitation. Need to look into this. • Having difficulty getting in every post storm meeting. Non maintenance drivers not always available. Some are done by phone. Consider post storm follow for select events. • Sometime there is a difficulty when patrol at crash and calls for truck and salt. Expects instantaneous deicing – repeat treatment. Consider spiked salt.

48. 08/09 Statewide Snow and Ice Strategies • Snow and Ice Term Definitions • Statewide Summary of Snow Plow Trucks and Drivers • Snow Plow Driving Simulator – having problems • Plan B considering stationary location until problems resolved • Determine a target for Frequency Measure • Market research • Set at 70% • To manage snow and ice costs – need to manage salt application • “Right Size Snow and Ice Operations” – Snow and Ice Model (formula) • RSS implementation projects still in the running • Expanded anti-icing storage and capabilities • Automated calibration

49. Snow and Ice Route Classification Change Current Proposed ClassADTRegainRegain Super > 30,000 1 – 3 Hrs 0 –3Hrs Urban 10,000 – 29,999 2 – 5 Hrs 2 – 5 Hrs Rural 2,000 – 9,999 4 – 9 Hrs 4 – 9 Hrs Primary 800 – 1,999 6 – 12 Hrs 6 – 17 Hrs Secondary < 799 9 – 36 Hrs None 1. Combine Primary and Secondary into one Class: Primary 2. Adjust Regain Times: SC = 0 - 3 Hrs, Primary = 6 – 17 Hrs • Ranges fit with the 2007 Bare Pavement Study. • Secondary has low ADT range, lane miles and high regain time. • No significant change in measured results compared to previous years. • Fewer classes makes data collection, analysis and management easier. • Recommended by MBMT and MKEG.