Today I scared the shit out of a couple of Harley riders and, to a lesser extent, the passengers I'm the car I was driving. I'm heading south on WY 26 into Cody and got behind a short line of cars going slow behind it truck. It's a straight, rolling stretch with good visibility. The pavement is shimmering and there are a couple of cars coming from the distance but there's plenty of room. I jump into the passing lane and get passed a couple of cars when my wife starts urgently encouraging me to "WATCH OUT!". It turns out the two cars in the distance were actually a couple of Harleys with the side by side round headlights significantly closer. The cars in the line I was passing were tailgating each other making it hard to get back into my lane. Hard on the brakes, push my way back into the line of cars, the two bikes go past, and all is good. I was really surprised to be fooled by the illusion. I wasn't goofing off. I was paying attention and being careful. I had plenty of room to pass safely before the two"cars" were coming. In the light and conditions the two headlights in the fairing close together looked exactly like automotive headlights in the distance.