Willie Nelson -- Bus Crash 911 Call ... 'I Don't Know How the Driver Made It Out Alive'

Willie Nelson's band members are lucky to be alive ... according to the man who called 911 after their tour bus crashed last week in Texas.

As we reported, 3 of Willie's band mates were hospitalized after their bus crashed along I-30, hitting a bridge pillar, roughly 80 miles from Dallas ... and it was real bad.

The caller feared the worst, telling the dispatcher, "I don't know how the driver made it out alive."

Willie wasn't on the bus -- he's got his own private ride. The other bandmates are out of the hospital and recovering. Willie's tour resumes December 10th in Vegas.