Snow and Ice Report Mn/DOT Operations Division Meeting June 2008 Maintenance: Snow & Ice Removal Hours to Bare Lane - . Notes: Jeff Butson New Measure - Bare Lane Frequency Winter Severity Index (Index ranges from ) 10 Year Ave Comp ared to 10 Year Ave District Compared to Statewide Distri ct Winter D D D D Metro D D D Statewide Iowa Analysis of Winter Severity Index Looked at data from 2000 to 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. 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 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 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. 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 Snow and Ice Route Classification Change 1. Combine Primary and Secondary into one Class: Primary 2. Adjust Regain Times: SC = Hrs, Primary = 6 17 Hrs CurrentProposed ClassADTRegainRegain Super> 30,0001 3 Hrs0 3 Hrs Urban10,000 29,9992 5 Hrs2 5 Hrs Rural2,000 9,9994 9 Hrs4 9 Hrs Primary800 1,9996 12 Hrs6 17 Hrs Secondary< 7999 36 HrsNone 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.