Which of the following statements is/are TRUE with respect to the type of stresses to be considered for the design of rigid pavements?
- Warping stress due to temperature differential between the top and bottom of the pavement slab as a result of daily variation in temperature
- Frictional stress due to the overall increase or decrease in temperature of the pavement slab as a result of seasonal variation in temperature
- Critical stress obtained as the maximum of the wheel load stress, the warping stress, and the frictional stress
- Critical stress obtained as the sum of wheel load stresses at edge, interior, and corner of the pavement slab
