OPI Road House Blues is from the fall 2011 Touring America collection. A dark blue crème, with some indigo in the base. The indigo really shows up in certain lighting. I found that to be especially true, when it came to time to photograph this color. It took several attempts before I found the right lighting, as to capture what looked to me to be the same color I saw before me.
The formula was great, which is what I would expect from OPI. Smooth application, with full coverage in 2 coats. I think this is a fantastic color for the fall/winter season. I don't have a lot of blues in my collection, but definitely more than your average person, or maybe even the average nail salon. I was not able to find a dupe. Some people may think this looks similar to OPI Sapphire in the Snow from Holiday Wishes, the winter/holiday 2009 collection. Sapphire in the Snow is definitely more purple than Road House Blues, enough to say it worth having both colors. I will do a comparison in the near future for reference.