Willie Nelson -- Band Members Hospitalized After Tour Bus Crash

3 of Willie Nelson's band members were hospitalized this morning after their tour bus crashed in Texas ... and the band's blaming it on an icy road.

The band's bus (Willie was in his own ride) crashed along I-30 around 3:30 when it hit a bridge pillar -- about 80 miles east of Dallas.

The most severe injury ... a broken hip. The other two guys walked away with bumps and bruises.

A rep for the band says the next four shows have been cancelled.

On the road again.

10:00 AM PST -- This is a photo of the gnarly damage.