Information is a critical part of the efficient and effective provision of winter service to the road-using public. Many actions taken during a winter storm are critically dependent upon good information. Yet often, information flow is barely considered at all as part of the winter service process. The aim of this paper is to examine how information can improve winter service activities, and especially to indicate how a lack of information can cause significant difficulties. The information needed during a winter storm is a function of who will be using the information. For example, a truck operator needs different information than a supervisor. In considering information flows, it is critical that the end-user be a key factor, both in the type of information provided, and in the manner in which it is displayed. Four different end users of information will be considered in the paper: supervisors, equipment operators, systems, and road-users. For each end user, the type of information needed will be discussed, the format in which the information should be supplied will be considered, and the sensitivity of the information will be reviewed. Sensitivity will be considered further as being a defining characteristic of the data supplied. Some information must be supplied to a substantial level of accuracy, whereas other data can be much more approximate and may indeed be qualitative rather than quantitative in nature. Again, the degree of sensitivity depends on the end user. Finally, a methodology will be presented to evaluate information sources and determine the extent to which the sources satisfy the needs of the end user. Appropriate information should be tailored to meet specific needs.