Fluidisation in saturated clay subgrades has emerged as a critical failure mechanism affecting the long-term performance of transport infrastructure. Fluidisation refers to the upward migration of fine particles under cyclic loading, driven by excess pore water pressure gradients, which can lead to progressive deformation and surface slurry formation. Unlike well-studied phenomena such as flow liquefaction, cyclic mobility, and cyclic softening, fluidisation remains insufficiently understood. This review examines current knowledge on fluidisation mechanisms, influencing factors, and mitigation strategies. Experimental studies have provided valuable insights into particle migration and pore pressure development; however, quantitative understanding of stress distribution and the associated pore pressure response at shallow depths is limited. Numerical investigations are scarce, underscoring the need for advanced finite element modelling integrated with experimental validation. Existing mitigation approaches focus primarily on corrective measures such as drainage improvement, while preventive strategies, such as columnar inclusions for stress redistribution, which can reduce excess pore pressure buildup, remain underexplored. Current design guidelines, largely derived from laboratory findings, require refinement through high-fidelity numerical modelling to ensure reliability and cost-effectiveness. Future research should establish unified diagnostic criteria, quantify stress distribution and pore pressure responses, and translate these insights into practical design and maintenance strategies to reduce fluidisation risks in clayey subgrades.