GPR for self-driving cars by (MIT) Lincoln Laboratory

In 2016, MIT Lincoln Labs used GPR for localization of self-driving cars. While I like the idea of people using their brains to avoid using LiDAR for self-driving cars, I somehow questioning this HD mapping approach because it basically contradicts autonomy. However, it is possible to detect if we are driving on the road or near to the edge using GPR which might be even more useful in really adverse conditions.