A friend of mine inspired me to look at Victor Sylvester's book "Modern Ballroom Dancing" and I found this in the book that I think should be mentioned here.
I quote.... "Once upon the floor, remember that other couples are also there. Avoid a collision, if possible, by taking shorter steps or altering your line of dance. If a collision does occur always apologize to the other couple, even if it was not your fault"
Yes, this is written under Ballroom Etiquette of his book.