-Based on data record from actual field tests at many roads
-Thailand has been using Empirical Design for more than 30 years
-Design method is simple, fast by using predefined formula or nomograph
-Design Factors are easy to obtain e.g. CBR,k,etc.
-Must select pavement materials from a predefined set of materials. Cannot promptly use other new materials (better or poorer) in design; need field road tests and data calibration before usage.
- Limited Design Conditions e.g. ESAL ≤ 10 millions
- Examples: California Bearing Ratio Method , AASHTO Method (1972) ,Road Note 29(1972) , The Asphalt Institute Method (1970)