IMO this is the major flaw. Tariffs could work in practice, but you'd have to announce them way ahead of time to give local businesses time to fill in the gap. Otherwise you'll get what happens now.
My driving instructor told me that you should blink to indicate that you're now going to move when changing lanes (exceptions excluded). So check if you're safe to go, and if you're sure, use the short blink and go.
That's fucking nuts.