The road isn't just regular black paper. It's textured, sparkly paper that almost mimics the sparkly flecks of mica you see reflecting light when you drive down the road.
The truck is popped up slightly to better define the dimension of the card.
The most amazing thing was placing the cards in the mailbox at the post office on Saturday at 3:45 p.m. and people calling me on Monday (two days later) to say they had received the card! Wow! Such the deal for 44 cents!