What follows are just my assumptions and observations but: I think it’s meant to discourage shopping or eating at rest stops or small towns along the way, or u

What follows are just my assumptions and observations but: I think it’s meant to discourage shopping or eating at rest stops or small towns along the way, or unnecessary contact between family & friends either at a destination or while in a car or minivan, travelling. They are in fact trying to discourage “any other movement” with the closing of gatherings over 10-50 people depending on jurisdiction, the call to practice social distancing (and only leaving your home when it is essential to do so), etc. They aren’t restricting truckers, who technically could carry and spread the disease because the point isn’t entirely to stop the disease at the border but to instead limit everyday movement to the essential. Assuming transport workers isolate themselves as much as anyone else does, the trade benefits far outweigh the potential harm, especially as truck drivers are often alone anyway, hard to spread it to others then. Compare this to personal travellers who meet and interact with small town folks or who travel as a group... lots of contact, lots of opportunities to share that which we don’t want shared. ;-)