I've lived in my house in St. Louis Park, MN for almost nine years now and I drive through the unorthodox interchange at Highway 100 and Minnetonka Boulevard on a daily basis. This year, MnDOT "upgraded" the signs on the southbound off ramp. Below are photos of what they put in.
This is in no way scientific, but no one I know (me, my wife Jane, or several neighbors I've asked) have ever seen a car parked on this off ramp or seen a car drive the wrong way. I'd like to learn more about the documented problem these signs are solving.
The signs are huge and frankly obnoxious in a neighborhood setting. Maybe these signs do solve a problem, but to my semi-educated eye they seem very out of place and a waste of money. In these days of limited resources, traffic engineers should be trending towards minimilasts when it comes to signs.