The percentage of the Department of Transportation's budget is for winter road maintenance is 20%..State DOTs (Department of Transportation) in snowy regions spend more of their budget on clearing roads during the winter season.The high percentage of the budget is necessary to reduce accidents due to loss of friction between roads and automobile tires, and to repair damage to roads. Even with this high spending rate, many accidents occur in the winter because of poor visibility and loss of traction due to slipping of automobiles.