We don't even try. In the US you demonstrate that you know the rules at one point in time and that's it, as long as you never get a DUI you're good.
For instance, the 2003 California Driver's Handbook[1] first introduced the concept of "bike lanes" to driver education, but contains the advice "You may park in the bike lane unless signs say “NO PARKING.”" which is now illegal. Anyone who took their test in the early 2000s is likely unaware that changed.
It also lacks any instruction whatsoever on common modern roadway features like roundabouts or shark teeth yield lines, but we still consider drivers who only ever studied this book over 20 years ago to be qualified on modern roads.
Some places will dismiss a traffic ticket if you attend a driver's education class to get updates, though you can only do this once every few years. So at least there have been some attempts to get people to update their learning.
> Anyone who took their test in the early 2000s is likely unaware that changed.
That's silly. People become aware of new laws all the time without having to attend a training course or read an updated handbook.
I took the CA driver's written test for the first time in 2004 when I moved here from another state. I don't recall whether or not there was anything in the handbook about bike lanes, but I certainly found out independently when it became illegal to park in one.
I don't doubt that many people are aware of many of the new laws. But I strongly suspect that a very significant number of drivers are unaware of many new laws.
For instance, the 2003 California Driver's Handbook[1] first introduced the concept of "bike lanes" to driver education, but contains the advice "You may park in the bike lane unless signs say “NO PARKING.”" which is now illegal. Anyone who took their test in the early 2000s is likely unaware that changed.
It also lacks any instruction whatsoever on common modern roadway features like roundabouts or shark teeth yield lines, but we still consider drivers who only ever studied this book over 20 years ago to be qualified on modern roads.
1. https://dn720706.ca.archive.org/0/items/B-001-001-944/B-001-...