chaipanha, wuttikrai (2020) “Development of Adjustment Factors affecting The Capacity of DRR Two-Lane Highways with Indirect Empirical Method”, Srinakharinwirot University Engineering Journal. Bangkok, Thailand, 15(3), pp. 65–74. available at: https://ph02.tci-thaijo.org/index.php/sej/article/view/240921 (accessed: 19 March 2025).