Abdul, R., Hakzah, H., Andriyani, A., Jasman, J. and Kasmaida, K. (2026) “Impact of Road Gradient on Fuel Consumption, Fuel Rate and CO₂ Emissions of Freight Transport”, ASTONJADRO, 15(1), pp. 284–294. doi: 10.32832/astonjadro.v15i1.21234.