Record the location and development of defects
When cracks or potholes appear after repairs, preserve more than information about their appearance. The road position, damage boundaries, general view of the section and adjacent elements are needed. A close-up photograph without a reference point may be of little use for comparison with an as-built drawing or a later sampling location.
Retain original files and note observation dates. If damage grows, successive records help describe its development. Identify separately any filling, drainage flushing, local patches and other changes. Such actions may remove some features of the original condition.
Retrieve the contract and pavement construction details
Technical comparison starts with the agreed result. The contract, design, quantity schedules, material specifications, concealed-work records and acceptance records are examined. For the upper layer, information about the base and overall construction also matters: a visible defect does not always mean that its cause is confined to the surface.
Mix or delivery documents establish particular information but do not automatically describe every working condition. Logs, as-built drawings, weather records and inspection reports may complete the picture. Missing documents should be reflected in the examination programme and subsequent findings.
Do not confuse inspection with testing
Inspection describes damage, its location and accessible geometric characteristics. Establishing material properties may require sampling and laboratory tests. These stages address related but different tasks. The required measures are selected according to suspected causes and design requirements rather than the longest available list of tests.
Sampling locations are agreed and recorded. Each sample must be traceable from a particular point to the laboratory report. The programme also addresses safe road access and reinstatement of the sampling location. An unidentified pavement fragment cut out independently does not replace these arrangements.
Check the associated conditions
Pavement condition is affected by drainage, shoulder and junction condition, heavy vehicle traffic and changes to adjacent land. Examining causes may therefore extend beyond a single pothole. Each additional object must nevertheless have a clear connection to the question being answered.
If water regularly accumulates after rain, photographs from the relevant period and runoff direction data are useful. Checking loads may require operating records. This information helps compare technical explanations but must not be replaced by assumptions about how the road is usually used.
Agree a clear result
The task can separately cover defect description, work-quality checking, cause examination, necessary remedial works and their costs. The same dataset does not answer every question. For example, justifying reinstatement costs first requires determining the technically necessary work.
The final document must show the inspection boundaries, information sources, measurement programme and connection between results and findings. If some causes cannot be established without further work, this should be stated explicitly. Such a result allows discussion based on verifiable road characteristics rather than general judgements of its appearance.