Our company performs diagnostics of road, railroad, and pipeline surface and subsoil. When determining the geotechnical conditions for the foundation of linear structures, a significant problem is achieving a compromise between the number of field investigations and the accuracy of the diagnosis of geotechnical conditions. The ground penetrating radar [GPR] technique reduces to a minimum the amount of classical geotechnical investigation required. GPR technique is also used to continuously monitor the roadbed and railway trackbed, without affecting traffic flow or train schedules.