As per IRC: 37-2012 in order to control sub grade rutting in flexible pavements the parameter to be considered is
1
Horz. tensile strain at the bottom of bituminous layer
2
Vertical compressive strain on top of subgrade
3
Vertical compressive stress on top of granular layer
4
Vertical deflection at the surface of the pavement
5
None of these
5
Question Not Attempted