It starts the same way every time: you merge onto the highway, settle in at about 60–75 mph, and then the steering wheel starts doing that faint-but-annoying shimmy. Not enough to feel dangerous, just ...

A steering wheel that vibrates at highway speeds is most commonly caused by wheels that are out of balance, tyres with uneven ...

The next time you're driving alongside a truck at highway speed, have a look at the wheels. They should be running straight and true without any wobble or vibration.