Road Mirage Shader?

Does anyone know how to make a road mirage shader to get effects like:

Tried with Screen Space reflections but couldn't seem to get anything close.

 

Mirages are an extremely non-trivial effect to reproduce with real time rendering. However screen space reflections are probably your best bet. The trick is going to be you'd need a custom shader on your road that uses a harsh cutoff Fresnel to modify the material properties from the rough dielectric road to a less rough metallic surface, like a lumpy chrome. Maybe with the normal being calculated from an animated noise function, though it might be better to implement that more as a post process "fog" effect since everything in the distance on a hot day has that shimmery look.