The paper deals with the investigation of parameters and influences for the system of evaluating the trafficability of vehicles through the terrain. Trafficability is one of the main aspects to ensure the movement of own troops, which falls into the main task of the Engineer troops - combat and general engineering support for all types of activities and operations of the army. Trafficability is the ability of a vehicle to move in rough terrain or on damaged roads and depends on many factors. The most used tool for determining trafficability in the Czech Army is the penetrometer. It is the PT-45 penetrometer, which is described in the Žen 2-16 Military Roads and Ways and the main evaluation criterion is the weight of the vehicle. Within the framework of international cooperation, soldiers encounter the manual FM 5-430-00-1 Design and design of roads, airports and heliports during events on the battlefield - road design, which works with a cone penetrometer and evaluates the throughput of the vehicle based on other factors such as properties of tires, ground clearance, engine power, etc. Inaccurate or incorrect evaluation leads not only to a stop the engagement of individual vehicles, but the entire convoy, which in terms of the operational task stops the manoeuvre and may lead to failure of the order. Therefore, it is important to know what parameters and influences have a fundamental influence on the system of evaluating the trafficability of vehicles, whether it would not be appropriate to add other aspects that will lead to higher accuracy of measurement, or, conversely, to exclude some. In solving this task, the authors decided to use the above-mentioned manuals and their evaluation systems. The objectives of the paper were achieved by analysis and calculations of individual parameters listed in these regulations, which affect the trafficability through the terrain, so that the degree of dependence is determined. It was found that some parameters have a major impact on trafficability and it is necessary to take into account even a slight change in these values. In contrast, other parameters are negligible as a result. These calculations confirm the suitability of updating the evaluation system for the telescopic penetrometer PT-45 to determine the trafficability of vehicles, so that it is possible to obtain more accurate results of measured values of the Czech army in the performance of tasks.
The support of mobility is one of the main tasks of engineer units. The mobility consists of different parts – mobility of low-endurable terrain, watercourses, forests etc. In this paper the authors focused only to one area – trafficability of areas covered by snow. The snowy terrain covered most of areas, not only in the Czech Republic, during the winter season. But the mobility must be ensured even in such conditions. In some cases, the vehicles mire in the snow layer and they have to be rescued. In the others, the convoy of vehicles stop before the untrafficable place and they have to overcome it. It is not always possible to bypass the place and the units have to negotiate this area. But the removal of snow is very time and human consuming. So it was decided to undergo testing materials suitable for these purposes. The aim of this work is to evaluate the using of perspective materials for self-rescuing works in snow as well as for the negotiation of untrafficable terrain due to the layer of snow. And all this makes it possible to improve the ability of negotiation obstacles such as snowy terrain and thus better mobility of the troops even in such conditions. [1,2,3]