Comparison of the maximum acceleration of a passenger car on selected pavements in wintertime

In winter, kinematic characteristics of motion are determined by varying external conditions and environmental conditions that affect the coefficient of friction. External factors affect the contact area with the road wheels in two ways: by changing the properties of the surface and affecting the mechanical properties of the tire itself. Change of tire-surface interaction parameters causes a decrease in obtained acceleration and consequently extending the braking distance of the vehicle.

Practical examination of longitudal acceleration in the racing car in the aspect of ground adhesion of bituminous surface

This work concerns problems connected with race car's behavior permitted to traffic motion on dry asphalt surface during braking and rapid acceleration . The characteristics of the vehicle is presented with particular reference to type of tires. Environmental characteristics and road surface were made. The result of the research and analysis are kinematic characteristics of the particular features of the vehicle enabling assessment the probable risk both for diver and other road users.

Surveying of landslide-dangerous areas by mobile geoelectric methods

The results of practical application of geoelectric methods of forming short-pulsed electromagnetic field (FSPEF) and vertical electric-resonance sounding (VERS), as well as georadar soundings on destroyed by landslide area of road are given. It is shown, that the presence of the zone with raised filtering of ground waters is the main reason of roadway erosion and landslide formation. The finding and mapping of water flow and area of the raised soil moistening can be realized operatively by complex of mobile geophysical methods.