It really depends on the circle of people that are at parties in the US. I've been the DD and have been at parties where there is at least one DD. I think there

It really depends on the circle of people that are at parties in the US. I've been the DD and have been at parties where there is at least one DD. I think there was a general consensus not to bother or pressure the guy DDing. All the fraternities and sororities would have a DD system running on fridays and saturday nights for their members as well, this is typical for a lot of universities but it only covers those members and their friends. I've also been at parties where I know there was no one DDing and I knew pretty much everyone drove there and didn't spend the night. Thankfully I lived in the college town with a decent bus system that got us around to most of the area for free so even if I couldn't get a ride, I could use the bus. I also purposely moved downtown just to have a ability to get almost anywhere without a car. The bus system was nice but getting between certain areas of town was hard depending on where you lived.