According to the Michigan Department of Transportation, the cost of road salt is up by more than 46% compared to last year. The news is certainly concerning because if M-DOT uses as much as it did last year, it will cost nearly 43 million dollars for salt. That would be huge chunk of the overall maintenance budget this year of 95 million dollars. The state used more than 650,000 tons of salt last year on state highways. Last year the state’s winter maintenance expenditures topped 136 million dollars, 48 million dollars over budget.