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-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)
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