The people who designed the T-Rex I-25 expansion were much smarter than the people who drive on them. The designers generously gave everyone a half-mile to merge on and off the highways...and yet, almost no one takes advantage.
Most people try to merge the second their tires hit the interstate, plugging up two lanes of traffic, creating a gauntlet of brake lights around every overpass.
It's as if they think if they don't merge at the first, inconvenient opportunity they will never merge at all, which is ridiculous. They literally have a half-mile to stop two lanes of traffic if they want. No need to do as soon as they get on the highway.