I want to begin riding bikes more for exercise and ultimately to commute to work.

Unfortunately I'm overweight and very out of shape. Work is about 20 miles away, along busy highways with big shoulders but moderate traffic. About 55 mph is the speed limit.

I'm trepidatious about obviously getting hit, but also I don't think I'd be able to go the whole way right off the bat. I'll train some first.

I'm thinking some kind of ebike like a Specialized Tero 3.0 but don't know. The shoulders can be pretty tricky/ gravelly so I was shying away from road bikes with thinner tires. I was leaning ebike because I think they're cool/fun, help me better keep up speed, and will ultimately help keep me motivated.

Any suggestions would be appreciated.