The 34-year-old driver of a coach which overturned at a motorway service station in Buckinghamshire is expected to be discharged from hospital.
The coach hit the kerb, a tree and lamppost before overturning
The man, from West Bromwich, was held on suspicion of drink-driving and bailed following the crash on the M1 at Newport Pagnell on 5 September.
A number of coach passengers remain in hospital following the crash.
A 45-year-old woman from Church Stretton, Shropshire, may be discharged from Northampton General on Monday.
A 20-year-old man from Gdansk in Poland remains in Milton Keynes General where his condition is described as stable.
A 39-year-old woman from Worcester and a 61-year-old man from Kenilworth continue to be treated at the JRII Hospital in Oxford.
The National Express coach clipped a kerb and overturned hitting a lamppost and a tree, in the crash.
There were 33 passengers on the Birmingham to Stansted coach and 30 of them were hurt, six seriously.
The driver has been bailed to return to Milton Keynes police station on 1 October.