What is the correct order of the main steps in the Mechanistic-Empirical Pavement Design method?

• A. I, II, and III only
• B. II, I, V, III, IV
• C. I, II, III, IV, V
• D. None of the above

Answer: (B)

The Mechanistic-Empirical Pavement Design method involves several key steps that integrate both mechanistic principles, which analyze how pavements respond to loads, with empirical data that reflects actual performance based on historical observation.

In the correct order, the steps begin with the selection of design parameters based on traffic loading and environmental conditions, which involves step II. This is followed by step I, where the analysis of the pavement structure is conducted using various mechanistic models and tools to determine stresses and deflections within the layers. Following this, step V encompasses the performance prediction, which applies empirical data to estimate expected pavement performance over its lifecycle. Next, in step III, any adjustments needed for the structural design based on performance predictions and local calibration are incorporated. Finally, step IV includes the actual design of the pavement structure where the material types and layer thicknesses are determined.

The sequence is logical as it follows the process from initial traffic and environmental assessment through to structural analysis and performance evaluations that inform the final design decisions. This systematic approach ensures that the pavement design is not only theoretically sound but also grounded in real-world performance data, leading to more durable and effective pavement solutions.

This complete sequence captures the essence of the Mechanistic-Empirical method, illustrating the integration of