When knitting a scarf, I found that as the scarf grew, it was getting heavy and in the way of efficient knitting.
I decided to roll up the scarf and secure it with the safety pin type stitch markers. One on each side. This kept the scarf in my lap as I knit and easy to turn for the next the row.
Machine knitters can also do this to keep the length from getting tangled in our feet as we work.