Bake the box cake per instructions
After it's completely cooled cut out the section you'd like to be the road. Enjoy the cake you removed or freeze to save for another time.
Crush 1 pkg of graham crackers and mix about 3/4 with the melted butter. This will make your first layer of the road (the sand layer). Spread it evenly along the bottom of the baking dish.
Crush the sleeve of Oreos and layer most of them on top of the graham/ butter mixture. This is your crushed rocklayer.
Next, either mix some M&Ms into the vanilla pudding before layering it on top of the Oreos, or put the pudding in first then place M&Ms into the pudding. (Cement/gravel layer)
Take the remaining crushed graham crackers and Oreos and mix it into more vanilla pudding. (cement/sand/gravel layer)
Finally, place your scooby snacks on top to finish off your road!
Let chill, then serve! Enjoy!