Which of the following is NOT a form of pavement deterioration?

The correct answer is that an increase in skid resistance is not a form of pavement deterioration. In fact, skid resistance refers to the level of friction between the vehicle's tires and the pavement surface, which is crucial for safety, especially during wet conditions. When pavement maintains or improves its skid resistance, it is indicative of a well-maintained surface that is functioning effectively to provide traction.

On the other hand, cracking, disintegration, and distortion are all recognized forms of pavement deterioration. Cracking typically occurs due to factors such as temperature fluctuations, aging, or stress from traffic loads, which can lead to problems if not addressed. Disintegration involves surface wear and breakdown that reduces the integrity of the pavement, often caused by environmental factors and fatigue. Distortion refers to issues like rutting or deformation of the pavement structure due to heavy loads or poorly designed surfaces, impacting the overall performance of the pavement. Thus, only an increase in skid resistance stands apart as a positive characteristic, rather than a sign of deterioration.