I don't think most schools explicitly give roadmaps. A list of courses and especially a list of required courses is a roadmap. Courses often start with a syllabus. But I don't think most students notice either roadmap. And why should they? If being systematically fed knowledge, the student has no need to know the system.

Added: Yes, the advice to autodidacts to seek roadmaps is good, but you imply that a student who starts at school and drops out is well-equipped for self-study, which I think is false.