Pretty simple: write a poem about something on the road.
We've all been on the road: sometimes crammed in the back with a sticky little brother; maybe with your right foot shoving the long, skinny pedal to the floorboard; or snoring drool all over the passenger window; or slapping one tattered Chuck Taylor in front of the other down a shimmering stretch of summer asphalt.
Write a poem about something on the road--
empty soda can
anything on the road.