I don't think you can reliably compare things on one variable like this. A counter-comparison that reaches an opposite conclusion: Here in Denmark the sentences

I don't think you can reliably compare things on one variable like this. A counter-comparison that reaches an opposite conclusion: Here in Denmark the sentences for drunk driving are considerably lower than in the US, rarely involving prison time. And yet drunk driving is less common. Typically the punishment is suspension of license and a fine, with the duration of suspension, and the amount of fine, increasing with higher BAC and with repeated offenses. The focus is on removing people from the roads (by suspending their license, possibly for multi-year periods), but not imprisoning them. In extreme cases (BAC >0.2%, repeated offenses, etc.), prison sentences of 20–40 days may be imposed, but rarely more. Details [Google Translate]: https://translate.google.com/translate?sl=auto&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=https%3A%2F%2Fwww.sikkertrafik.dk%2FRaad-og-viden%2FI-bil%2FAlkohol%2FStrafferamme-for-spritkoersel.aspx&edit-text= https://translate.google.com/translate?sl=auto&tl=en&js=y&pr...