He told Austrian media he could not see signs for the 30km/h (18.5mph) limit on that stretch of road in the dark - and drove at the standard 50km/h (31mph).
Unfortunately it took more than a month for the first penalty to arrive - by this time Mr Wallner had clocked up dozens more still unaware that he was breaking the limit for that road.
When Mr Wallner received his first speeding notice in May it occoured to him that there would be more to come - and it may get very expensive.
Mr Wallner said he did not notice the speed camera - set up near a school on the route - because the area was always very dark in the middle of the night and the camera that caught him was an infra-red camera, which does not fire a visual flash.
Out of about 50 trips, he was recorded driving at a consistent 50km/h 42 times in a row.
In order to avoid the lengthy and expensive procedure to challenge them, he paid all 42 penalties.
He told Germany's Süddeutsche Zeitung: "You cannot lodge an appeal against all the fines in one go, so I would have had to make 42 separate challenges."
"These are a good two months' wages for me, and there's no rebate for a bulk fine either."
However police did remove about €300 from his total.