The train doesn't need to be cramped. And if you aren't occupied with controlling a vehicle, you can actually use your time for something useful or enjoyable.
And while cruising down an empty hightway might be very nice, it's excedingly rare for anyones daily commute to be like that.
That is not a commute. That you can do what you describe on holidays and weekends when the weather is fair and there isn't much traffic is not a good reason to create traffic, destroy the climate and the local environment, waste your own money and being frustrated in traffic jam.
People are buying cars because they believe in the commercials where the car means freedom. But people use cars to waste their lives in traffic.
And while cruising down an empty hightway might be very nice, it's excedingly rare for anyones daily commute to be like that.