Thickness determination for unbound flexible pavement

Cumulative equivalent standard axle load (ESAL) 

Light traffic, parking lots, driveways and light rural roads Medium truck traffic Heavy truck traffic 

Source Asphalt Institute, MS-1, The Thickness Design, Asphalt Pavements for Highways Streets, Manual Series No. I (MS-1), 9th Edition, Lexington, USA Asphalt Institute, Reprinted 1999. With permission. 

The methodology requires minimum thickness of asphalt layers depending on the level of traffic. These minimum requirements are as shown in Table 13.2. 

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