Flexible Pavement Design (JKR Method)

Ref: JKR Arahan Teknik Jalan 5/85 (Revised 2013)

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ESAL = ADT_cv × TF × 365 × DD × LDF × GF

Ref: JKR Arahan Teknik Jalan 5/85 (Revised 2013)

GF = ((1 + r)^n − 1) / r

Growth Factor

TC from cumulative ESAL → pavement layers from JKR design table

Pavement thickness lookup

Traffic Data

ADT Commercial Vehicles (veh/day)

Vehicles >3 tonnes (from traffic count)

Truck Factor (TF) (ESAL/veh)

Typical 1.0–5.0 (ATJ Table 2)

Traffic Growth Rate (%)

Typical 4–6% per annum

Design Period (years)

Typical 10–20 years

Distribution Factors

Directional Distribution (DD)

Typically 0.50 for 2-way roads

Lane Distribution Factor (LDF)

1-lane: 1.0, 2-lane: 0.80, 3-lane: 0.60

Subgrade

Subgrade CBR (%)

From lab CBR test (soaked, 4-day)

Disclaimer: This output is an engineering calculation aid only and does not constitute a final or endorsed design. All designs submitted to Malaysian authorities must be endorsed by a registered Professional Engineer (PE) under the Board of Engineers Malaysia (BEM) in accordance with the Registration of Engineers Act 1967.