The line follower hits a crossroads — literally. Students add intersection detection to their existing line following program using a second, lower threshold on the same color sensor. A direction variable set before the loop controls what the robot does when it detects a full black intersection. Clean logic, real decision-making, satisfying to test. What's included in the powerpoint:Link to editable teacher slide deck (10 slides)Link to editable student worksheetLink to editable teacher answer k