ABSTRACT
Up to 146 borings were made to investigate the 8 km length of the highway, comprising a drilling total of 3 071 m, which corresponds to 384 m of drilling/km.
Of all the drilling carried out, around 72% was made for the surveying of special engineering structures (bridges and tunnels), whilst the remaining 28% concerned the highway itself and the retaining walls. Of the survey works carried out for special engineering structures, an average of 203 m of drilling/bridge (21 m/support) and around 233 m/ tunnel (144 m/km) were made.
