Hi! I have to make a wedding cake in a couple of weeks that will be carrot with a buttercream. The wedding is 5 hours from my house and as I am pretty new at this, I'm not sure how I should play this out. Will the cake survive the 5 hours pieced together(3 tiers) or is that something I shouldn't risk? What are some advice or ways I could get it transported safely! This is a really good friend so I really dont want to ruin it! Thanks in advance! 

For your own peace of mind I would transport with each tier boxed individually and then stack them at the venue. If you can, arrive a bit early and see if you can borrow some fridge/cool room space to help things get firmed up again before stacking if that makes you a bit more confident. 

I have great air con in my car but I use styrofoam eskies (cooler / chilly bin / chill box) with one of those freezer block things in it to keep each tier nice and cool for transport. 

Hope that helps!

I would do exactly as me_me1 suggested.  I no longer transport stacked cakes, as it is so much less nerve racking to transport individually boxed and stack at the venue.