You can measure mixed risk like this in hours exposed, since the outcome of a car and bike trip in Denmark is the same (you get to work or whatever). That will

You can measure mixed risk like this in hours exposed, since the outcome of a car and bike trip in Denmark is the same (you get to work or whatever). That will also be fairer to cars, since I suspect there are more deaths per KM for cars. I ride my bike just shy of 40kms per commute, the same amount I would drive.