Riding a motorcycle on a highway is a great way to remind yourself of your own mortality—especially as trucks pass you.
I feel safer on a highway than in a city. Less chance of someone cutting across in front of you.
If you are going slow enough that trucks are passing you, you either have the wrong bike or you are doing it wrong.
Perspective changes on a highway. To me, riding a bike on a highway was not the way I thought it would look from observing a motorcycle from a cage. It was more like riding it on a huge parking lot with lots of extra room. It’s usually easy to keep far enough from trucks to avoid a problem as long as the truck behaves itself.