What are the different types of joints in rigid pavements?

Rigid pavement joints include: Contraction joints - transverse saw cuts allowing controlled cracking at 4-6m spacing, depth 1/4 to 1/3 slab thickness. Expansion joints - allow thermal expansion, filled with compressible material, used at intersections and fixed objects. Construction joints - between paving days or lanes, may use tie bars or dowels. Longitudinal joints - between lanes, use tie bars for aggregate interlock. Dowel bars transfer loads across transverse joints; tie bars hold longitudinal joints together.