This masters thesis can be considered as a summary of the winter road maintenance research in Austria and is based on the conclusions of the research projects "Optimization of wet salt spreading"  and "Suitability criteria for thawing grit in winter road maintenance"  as well as further relevant research projects on winter road maintenance in Austria. In addition, more detailed investigations were carried out as a basis for the optimization of winter road maintenance in Austria, as it is currently not sufficiently understood to what extent the thawing performance of wet salts can be classified between the thawing performance of solid and liquid de-icing agents (Chapter 2) on the basis of the current laboratory procedure. Furthermore, the speed of ice formation under real winter temperatures with and without preventive measures (Chapter 3) has not been studied yet, which is, however, essential with regard to the determination of the time until ice formation. While an increased brine content is advantageous for spreading and minimizing spreading loss , high air humidity or an unintentional moistening of the road salt is unfavorable for storage in halls and salt silos. This moistening causes the formation of lumps and decreases the flowability in the salt silos, which makes the preparation and loading of the spreading vehicles more difficult. On the basis of initial tests on pourability based on the device "Auslaufbox nach Sonntag" (pouring out box acc. to Sonntag), a repeatable test method was established and the effects of drying processes on solid de-icing agents quantified . With regard to the avoidance of sedimentation and the increase of the storability, further investigations on the effects of different moisture contents and anti-caking agents on the pourability (chapter 5) are regarded as necessary. In additional tests, the question of whether these anti-caking agents have an influence on the thawing performance depending on the dosage will also be clarified. Snow clearing is an essential point in every winter maintenance, since snow does not have to be thawed and a good snow removal pattern is therefore essential for economic winter maintenance. Many different snow plough systems are currently available for clearing snow, which can be operated with various additional equipment such as plough relief, additional clearing strips, etc. Some manufacturers state the clearing capacity (m/h) of their ploughing systems, but there is no information available to evaluate the clearing pattern. However, especially on roads with poor evenness (longitudinal evenness, ruts) considerable differences exist in the remaining quantities of snow. Since there is little reliable data available with regard to both the wear of the scraper blades and the residual amounts of snow under comparable conditions (Chapter 6), corresponding surveys and experiments are part of this work. According to previous studies, the spreading and application losses immediately after the application of de-icing salts are particularly high, which is why any improvement to increase the residual salt quantity results in substantial savings in winter road maintenance. If the amount of residual salt remaining on the road can be reliably determined, this would be essential for practical deployment planning and the necessity of further spreading. Various devices/systems are available for residual salt measurement, but there are hardly any official comparative measurements between them. In Austria, the SOBO 20 residual salt measuring instrument Beiträge zur Winterdienstforschung Seite V from Boschung is most frequently used. However, it is not known whether the SOBO 20 measures the residual salt quantity of solid, moist and liquid de-icing agents equally well and how high the respective measuring accuracy (Chapter 7) is. Furthermore, there is still a need for research with regard to the development of the residual salt quantity as a function of duration of exposure, traffic load and road condition. Especially with regard to preventive spreading in cases of slippery frost or before expected snowfall events, the duration of exposure to de-icing agents is of particular importance. The relationship between the measured data of stationary ice detection systems and mobile residual salt measuring devices is also an open aspect which will be examined in more detail in this thesis.