Yes, Test Driven Development (TDD) can be successfully applied to legacy systems, though it may present unique challenges. TDD is a powerful approach that involves writing tests before writing the actual code, ensuring that the system meets the required functionality. However, when dealing with legacy systems, the application of TDD may require additional steps to overcome certain obstacles.

One of the main hurdles in applying test driven development to legacy systems is the lack of existing automated tests. Many legacy systems have been developed without a testing suite, so adding TDD to these systems often begins with writing tests for the existing codebase. This process may involve a significant amount of refactoring and understanding the system's intricacies, but it’s essential for improving the quality and maintainability of legacy code.