This book‎,‎ based on Transport and Urban Development COST Action TU1208‎,‎ presents the most advanced applications of ground penetrating radar ‎(‎GPR‎)‎ in a civil engineering context‎,‎ with documentation of instrumentation‎,‎ methods and results‎.‎ It explains clearly how GPR can be employed for the surveying of critical transport infrastructure‎,‎ such as roads‎,‎ pavements‎,‎ bridges and tunnels and for the sensing and mapping of underground utilities and voids‎.‎ Detailed attention is also devoted to use of GPR in the inspection of geological structures and of construction materials and structures‎,‎ including reinforced concrete‎,‎ steel reinforcing bars and pre/post‎-tensioned stressing ducts‎.‎ Advanced methods for solution of electromagnetic scattering problems and new data processing techniques are also presented‎.‎ Readers will come to appreciate that GPR is a safe‎,‎ advanced‎,‎ non destructive and noninvasive imaging technique that can be effectively used for the inspection of composite structures and the performance of diagnostics relev‎.‎‎.‎‎.‎