I am delivering a wedding cake tomorrow and some of the stacked cakes have bulges in them, not terrible but not great either. I poked holes in the frosting where the bulges are but I am now worried about driving with the cakes. Will the bulges get worse? Is there anything I can do to stop the bulging from getting worse or do you think the little holes are enough?

Any advise would be great. THANKS!!!

For the most part I don't think poking holes will help at all.
It depends how the roads and how you drive if it will get worse - some of ;mine have, some not.