They don’t look like crutches — more like part of a Rube Goldberg contraption. But when Bill Shannon uses them to glide down the street on his skateboard — bouncing, balancing, hanging suspended in the air — they’re miracles in motion.

Maybe you’ve caught him doing his thing on Visa ads and music videos. This week you can follow him gliding down the street as you sit in a tour bus cruising along behind him in “Traffic,” a dance piece running tomorrow through Friday.

Shannon, a father of two who turns 40 this week, comes by his art naturally: Born with a hip deformity, walking was difficult for him, so he turned the crutches he used to get around into an art form.

His round-bottomed crutches don’t look like anyone else’s. “It looks like I robbed a trombone,” he says. The uncommon style is perfect for Shannon’s moves and tricks.

To give people a sense of what it’s like to be him, performing on his skateboard, he thought of that bus ride; on it, they’ll pipe in the same music he’s hearing on his headphones.

Shannon’s rooted in freestyle and hip-hop, so this week’s performances aren’t scripted.

“It’s kind of like fishing,” he says. “There’s no guarantee we’re going to catch anything.”

Expect “Traffic” to last about an hour — depending on traffic.

“Traffic” by Bill Shannon. Dance New Amsterdam 280 Broadway (enter on Chambers Street). Tickets and info, 212-625-8369 or dnadance.org.