Which vehicle(-s) is/are NOT likely to be visible to the truck driver?

Trucks have large blind spots, called No-Zones. A car traveling in a No-Zone may be completely hidden from the truck driver's view. The truck's side mirrors provide only small arcs of visibility down the sides of the truck. A vehicle that is right behind the truck or to the side of the truck, just behind the cab may be in a No-Zone. Here, Car A should be visible through the truck's windshield, and Car C should be visible in the truck's right side mirror. But Car B is unlikely to be visible to the truck driver. It is impossible to always avoid a truck's No-Zones, but don't remain in its No-Zones any longer than absolutely necessary. [Trucker's Blind Spots, Large Trucks and RVs, Sharing the Road, New Mexico Driver Manual]