"Every person is so important and that is just tragic," he said.
"There is nothing that can replace that person. That's a family broken forever.
"The crashes that we are having are needless, more often than not these crashes are happening because someone has made a mistake."
Mr Greally said safety messages were not getting through to road users. Everyone needed to think of these people and their families and drive the same as the day they passed their licence test, he said.
"Don't we sound like a stuck record at times, it's Bill Murray in Groundhog Day. We have to hope for the best every long weekend, or every day that we wake up, that someone hasn't died, but because of the culture on our roads the reality is that people will die.
"If you're good enough to understand the safety rules [when you're sitting your licence] then you should be good enough to practise those rules every day. We are picking up the trauma and it's the hardest thing in the world to tell a person their family member is dead.
"We just want people to do the right thing."