Does anyone have instructions on how to carve a road of life cake to curve all the way up?

Try this tutorial 

http://cakecentral.com/a/how-to-carve-a-spiral-cake

Here's another link to awesome tutorials on carving cakes!  It has a ton of them, but if you scroll down towards the bottom of the page, there's one called How To Carve A Spiral Cake.

http://www.pinterest.com/socbeatty/sculpted-cake-tutorials/