Roy Trundell, 62, of Solway, Hailsham, died in September 2006 when he was trapped between two vehicles at the Eastbourne Buses depot in Birch Road. He later died at Eastbourne District General Hospital.
The father-of-two had been wearing a high visibility jacket and was described by his wife as very safety conscious.
Paul Rudland, a training manager for the bus company, gave evidence at the inquest yesterday at Eastbourne Magistrates Court. He said since the accident more walkways and zebra crossings had been installed at the depot, a banksman had been employed to supervise reversing buses and all employees had to sign a statement to say they had received reversing training.
Mr Rudland did not see the collision at 8am that day as Mr Trundell transferred from one bus to another. At the time Mr Rudland was moving a bus to make room for another bus driven by Ben Jones.
Mr Rudland told the court, "I was just being helpful, I was reversing a double decker to create room. I can just remember getting into the bus, I looked behind me and didn't see anything behind the decker.
"I didn't see what Ben was doing apart from when I heard a commotion. I applied the handbrake and tried to warn Ben there was another bus behind him but by the time I had got out of the bus it was too late."
Mr Trundell was trapped between Mr Jones's bus and one behind him. Mr Rudland was unsure when the rear bus had come into the depot.
Mr Jones was a fully-trained bus driver and Mr Rudland said his vehicle had been moving at a slow speed, just above "ticking over".
Asked what training drivers had received before the death, Mr Rudland said they were told to sound the horn when reversing and to ask for help if unsure. But he added, "The majority of them, from what I could see, just jumped in and went backwards."
All Eastbourne buses have warning buzzers which sound when they reverse unless disabled, such as when reversing late at night. Mr Rudland's buzzer was sounding but he could not hear whether the buzzer of the bus which backed into Mr Trundell was.
The Health and Safety Executive is investigating the incident.
A statement from Mr Trundell's widow, Mary, a retired housekeeper married to Roy for almost 41 years, was also read aloud by coroner Alan Craze. She described her husband as a safety-conscious man who would often give younger bus drivers advice. He always wore a fluorescent high-visibility jacket when in the bus yard.
Mrs Trundell said he never reversed unless he had to and said, "He was very observant. I cannot understand why he was between two buses if the one in front was reversing. If it had its engine running or a reverse klaxon sounding there is absolutely no way he would have walked behind a bus."
Mr Trundell began as a bus driver in London almost 37 years ago and began working for Eastbourne Buses in 2000. Passengers nicknamed him 'the Cockney bus driver'.
Mrs Trundell said, "He was very keen on gardening and DIY. He was a very calm and relaxed man, a family man who doted on me, his children and granddaughters."
The inquest continues.