These record defects that remain undetected by machine-based methods. As the
method is slow and laborious, it is usually targeted on specific areas in particularly poor condition. The surveys provide factual information for deciding on
the most appropriate structural treatments, and identify sections of highway
suitable for remedial treatment. Planning for long-term treatment can thus be
undertaken, with performance of the pavements being monitored and priorities
for treatment being established on the basis of the database compiled