It's easy to read speed limit signs. What's more complicated is reading a sign on the left that says 70mph, and under that says in left hand lane between hours 9am and 5pm, then a sign on the right that says 50mph, and under it says only in right hand lane. Doubtful we'll see that kind of logical association and memory for which lane it's in. Someday, yes, but not for quite awhile.