> I don't get why we aren't looking into slightly changing our roads to better work with self driving cars when all it takes is a little more paint.

Because 99.9999% of drivers are human and have no issues seeing the concrete barriers and not hitting them head on at full speed. Until self driving is better than humans in all cases it will not be acceptable.

Nobody will spend money to adapt roads to self driving cars until they comprise a significant percent of cars (read: decades from now, if ever)