The OKO-3 GPR Road Set uses special horn antennas (400-2500MHz) suspended above ground level and fixed to the vehicle by car suspension. The complex offers the users the single-channel and multi-channel solutions for high resolution survey up to 80 km per hour. Geotech has a big experience of geosical research on highway and collaborates with the leading Russian Road Companies. Application: Engineering geosical surveys for highways and overbridges construction; Determining thickness of road pavement structural layers; Detection of subsidence; Detection of non solid and watered zones; Study of engineering geological conditions of the zones liable to deformation; Study of dangerous engineering geological processes: Landslides, floating earth, karstic nomena; Checking highway pavement structure compliance with project documentation. The Horn antennas (with central frequency from 400 to 2500 MHz) are designed for the detailed examination of pavement layer thickness.