[_vertigo]

What are some other better ways to normalize?

[gsnedders]

Other common approaches:

1. Per capita

2. Per registered vehicle

3. Per trip

All of these have upsides and downsides (as does “per vehicle km”), and all will paint different pictures with different distortions.

[biophysboy]

Honestly, just per 1M person per year. If this normal incidence went up while the exposure incidence rate went down over 20 years, I'd wanna know.

[cozzyd]

Per trip?