More details from Norwegian newspaper Verdens Gang. Appears he was totally alone and not in sight of anyone at the moment of the crash...
(google translation) :
Local police told VG that the investigation into the death started immediately. They only became aware of the accident after a random passerby had found the cyclist.
According to Lindner (a representative of Heiligenblut police station in Austria), the accident happened at 1 pm on Saturday. Furthermore, Lindner says that the police started immediate first aid when they arrived at the scene of the accident. Drege was eventually picked up by an air ambulance where the doctors continued first aid. But life was not to be saved.
The police officer says that they will get more answers in the case in the coming days. - We have obtained several items from the crime scene which will be analysed, says Lindner. Both the bicycle and the speedometer on the bicycle are among the objects that the police hope will help them to conclude what actually happened.
No one is said to have witnessed the accident, according to what the police know so far. They are calling for possible witnesses in the case.