Texans defensive end Mario Williams says he was not racing in a video posted on several Internet Web sites that shows him speeding on a North Carolina highway, but he admits it was a foolish mistake. The video was shot last week while Williams was in Raleigh, N.C., for North Carolina State's spring football game Saturday. Williams, who was drafted No. 1 out of North Carolina State in 2006 by the Texans, is shown driving a Lamborghini LP640, which he recently purchased. "It was a stupid thing to do, and I apologize to the fans, the organization and my teammates for not being smart, " Williams told the Chronicle on Thursday night. "I shouldn't have put myself in that situation, and I have definitely learned my lesson."

The Houston Texans on Thursday signed wide receiver Andre Davis. Terms were not disclosed.

Andre Johnson and Matt Schaub stood on the practice field chatting and laughing, smiles planted firmly on their faces. It didn't take long for the Houston Texans' quiet Pro Bowl receiver to warm up to his new quarterback. On the first day of Houston's voluntary offseason workouts, the two looked like old friends. "Every time we see each other we're just talking, trying to learn things about each other," Johnson said. Many of the Texans joined Johnson and Schaub at the 45-minute conditioning workout, including last year's top draft pick Mario Williams and newly acquired running back Ahman Green.