  We study the formation of three-string junctions between (p,q)-cosmic
superstrings, and collisions between such strings and show that kinematic
constraints analogous to those found previously for collisions of Nambu-Goto
strings apply here too, with suitable modifications to take account of the
additional requirements of flux conservation. We examine in detail several
examples involving collisions between strings with low values of p and q, and
also examine the rates of growth or shrinkage of strings at a junction.
Finally, we briefly discuss the formation of junctions for strings in a warped
space, specifically with a Klebanov-Strassler throat, and show that similar
constraints still apply with changes to the parameters taking account of the
warping and the background flux.
