The road is made with crushed graham crackers and edged with chocolate chips (and if you're an engineer don't look too closely at the road where it goes around the edge on that little hill, ok? I know, it's totally undrivable, shhh!!)
Unfortunately some of these photos came out a bit fuzzy (wiggly boy!) but they're still cute, and they show him for the gleeful little boy that he is:
Happy First Birthday Kiddo!!