In the video tutorial below I'll show you how to knit '2 over 2' cables by crossing two stitches over another two stitches. This creates a 2-stitch wide cable and is a popular technique you'll see in many cable patterns.

The demonstration includes 4 different 2/2 cables, including purl crosses which is where two knit stitches are crossed over two purl stitches. Purl crosses are usually used on a reverse stockinette stitch background, where it is purl stitches that form the right side of the knitting.

This type of cable is called a traveling cable because it only crosses over the background stitches,  rather than over other cable strands. It can therefore travel wherever it wants to over the surface of the knitting.

If you compare 2/2 cables to 2/1 cables (as an example), they are both 2-stitch-wide cables but the 2/2 cables move at a different angle across the knitting. This is due to the 2/2 cable crossing over 2 background stitches at a time, rather than 1.