"We don't want any risk to people or property, so we have been proactive in surveying the trees' condition and in pruning along that street over the last 12 months," said Emmett Mackle, who is the university's associate director of facilities, property services.
"Unfortunately, the arborist said this branch looked fine from the outside and its interior rot was not picked up.
"We are sorry to hear this has happened but it is rare given there are 300 trees of 100 years old or more."
Mr Mackle said repairs to the car should be covered by the motorist's private insurance, because the falling branch was the result of an unexpected failure of the tree.