1968 and I'm Hitchhiking through Europe- Joe Mack

A college student's summer vacation in Europe in the 60s. Quite a charming read as the book wasn't so much about what he had seen in Europe but the people he had met. I wonder if the world is as opened as it was back in the 60s, where people were unafraid of inviting strangers they had picked up from the road to their home for dinner. Is hitchhiking a thing from the past or is it still a viable mode of travel? With the world a less safer place than it was, I believe the former might hold true.