New approach to road trip sing-alongs: They sing without ever saying a word!

(WITI) -- When Paul and Tina Sirimarco get in their SUV for a road trip, they know there'll be singing involved. But their road trip sing-alongs aren't typical.

You see, Tina is an American Sign Language Interpreter -- and Paul, well, he's not. But together, they use their sing-alongs to brush up on signing. Take a look.