Roads. Cars and busses will be on roads.

Tracks. Trains and light rail will be on tracks.

I’d say both are pretty predictable.

There are also far fewer of them per passenger, so fewer chances for one to come by. They are also operated by professionals who can call in sick if their ability to operate the vehicle is impaired.

A bus could be ten times deadlier in a crash than a car and it would still be safer if it carries fifteen passengers. It could be a thousand times deadlier if operated by a drunk person and still be safer than cars because drunk people don’t operate the vehicle when getting home by bus.