Download #btjizh 05 Nov 2015 LEGO MINDSTORMS EV3, Light and Color Sensor, FLL, Programming K.Mitov Tutorials Crossed lines (T Sections). Positioning. Part 2. This second part continues with importing two previously developed in Episode 53 blocks into our program. With them we can for align to lines. We program the robot to align to the cross line and start following it.