In May 2005, Cowher warned him about safe riding after Cleveland tight end Kellen Winslow Jr. was injured in a motorcycle accident. Winslow tore knee ligaments and was lost for the season.
New England quarterback Tom Brady was at a charity golf event when he found out that Roethlisberger was injured riding a motorcycle.
"You try to take some of those things and put them off for a later time in your life," Brady said, "but sometimes people want to live their lives and have fun and I think sometimes things happen like that. Hopefully, he's OK."
Roethlisberger, whose mother, Ida, died in a car accident when he was 8 years old, continued to ride after Winslow's accident and that angered Terry Bradshaw, who quarterbacked the Steelers to four Super Bowl victories during the 1970s.
Visiting the Steelers' training camp last summer, Bradshaw remarked: "Ride it when you retire."