Possible Clues:

• Result of too many rusty nails on the road?
• Offense that might result in a revoked lic.
• It saddens SADD
• License-losing letters, maybe
• Serious traffic violation
• One weaving on the rd., perhaps
• Cause of a post-bender fender-bender?: Abbr.
• 1976 charge for G.W.B.
• Weaver's offense?
• Cause for a citation