Final answer:
The correct option that is not caused by exceeding the designed traffic volume and load on a roadway is polished aggregate. It is a result of repeated traffic wear on the road surface rather than the weight and amount of traffic.
Step-by-step explanation:
When the traffic volume and load are significantly higher than what was originally designed for a roadway, several forms of distress can occur. These distresses include structural damage to the pavement that affects its longevity and usability. Rutting, fatigue cracking, and block cracking are examples of such distress. However, the one type of distress that is not directly caused by excessive traffic volume and load is polished aggregate.
Polished aggregate occurs when the repeated passing of vehicles wears down the surface roughness of the aggregate, making it smooth and potentially slippery, particularly when wet. This condition is related more to the type of traffic and the material characteristics of the aggregate rather than to the amount of traffic and the weight of the vehicles. Therefore, in the context of the given options, polished aggregate is the correct answer as it is not a distress caused by traffic volume and load beyond the designed capacity of the road.