Nobody adds an E to ROAD outside of sites like SDN -- and even here this is a recent development. Some see EM as a lifestyle specialty because shift work keeps the hours atypically low. But the salaries don't really compare to eg derm or rads thus far. And the competitiveness is not yet in the same ballpark as most of those other fields (gas has had bad years when it was less competitive, but seems to be on the upswing). So I think it's perhaps an exaggeration to add the E. I wouldn't use that acronym outside of SDN -- folks will look at you oddly because this is definitely not common parlance.
The average hours of post-residency folks in ROAD specialties is still about 60 hours/week (rads and gas often exceed this, optho and derm often come in slightly under). In most medical fields you can expect to have to work at least some weekends, and take some call. Folks I know in the ROAD specialties certainly take their turns working weekends in their practices. Other fields, like surgery, may involve even more weekend work. And if you are talking about the clinical years of med school and then residency, expect to work a lot of weekends.
As mentioned in other threads, medicine is a really bad choice if you want to have a 9-5 M-F career. It is not the norm in medicine.
And OP, since some of your other posts suggest you are interested in ortho or neurosurg, I think it's safe to say you will be working a LOT of weekends. More than most medical fields, which in turn are more than most non-professional jobs. If you are going down this road, you just have to put a lot of that kind of stuff to the side. You work hard and enjoy yourself on the rarer days off. But really no point focusing on this kind of thing at this stage. Too much happens in life between where you are now and where you will be then, that reasons you can't even conceive of right now may be pulling you toward lifestyle options. So worrying how many weekends you will be working might not be the best use of your time.
I would also note that the current IOM recommendations, which may go into effect in a few years, maintain the 80 hour work week limitation for residents, but limit the number of hours in a row one can work. This probably will eliminate certain call structures at the expense of a lot of weekend hours. So expect to be working fewer hours a day for more days a week in some fields under the new rules.