This paper deals with the joint efficiency in concrete pavements experimentally and analytically.
　For experiments, a test pavement was constructed which has granular subbase and 27 cm thick concrete slabs. This test pavement has four types of joint:a dummy joint, a keyed joint and two dowel joints (φ32.38mm). A series of loading test was performed on each joint with keeping joint opening under control.
　A finite element method programmed for this research work was used for numerical analyses, which can take into account of discontinuity of load transfer across the joints.
　In conjunction with the experiments and the numerical analyses, it was pointed out that concrete slabs for airport pavements should be desinged using stresses not inside but at joints of slabs.