[jandrewrogers]

No, many ordinary cars contain image classifiers that read speed limit signs dynamically. This is pretty standard. And they sometimes get it wrong e.g. my car reads 80 MPH as 60 MPH about a third of the time, much to my dismay.

The dynamic classification is required because the world isn't static. An increasing number of locales have digital speed limit signs that vary the speed limit dynamically, some times independently per lane. Automation requires cars to respond to the world as it is, not how the world was when it recorded a month ago.