A man decided to join a ride-sharing program with his colleagues at work to save money. But within a week of starting it, he started having severe wrist pain. This seemed to happen only while they were driving through the tunnel–he was fine outside the tunnel. Because the tunnel was so busy, they spent quite a bit of time in there. So it was quite a painful experience for the young man. He saw a doctor the following week and was told he had a problem that is quite common nowadays: carpool tunnel syndrome.