Guild Wars 2

So I normally run with signet of shadows which is a +25% run speed buff. I have been collecting runes of the traveler for my magic find set, and the 6 piece bonus is a +5% run speed buff.

Will this stack with my 25% run speed buff to be 30% run speed, or is it just not worth it and stick with 5/6 and use some other runes instead?

Has anything official been said about movement speed stacking?

It only uses the highest bonus.