Identified "flying" object

Jose at http://www.qsl.net/w5www/stories2.html gave a description of an uncanny light that more than likely came from something inside the car, or a street light outside the car.
"Next observation I had was when going I a car just a few years ago with my friends. Just for a brief moment between some trees and woods while riding in a car I manage to got a glimpse of the TV tower in Stockholm (Kaknästornet). I cant believe this is happening to me I remember thinking to myself. A big ball shaped object is hanging over the tower."
Anyone who has ridden as a passenger in a car for a long enough period can notice strange objects "hovering" over whatever they see in the window. This is called an "optical illusion." For example, if your dome light is on, and you look at a mountain in just the right angle, it looks like a "saucer" is floating over the mountain. Wow! A close encounter of the third kind! Except different. It's sort of like that "paranormal" novelty bowl that presents the illusion of a penny that magically "floats" above the bowl. It's all done with reflections.
"There I was, in the car with my friends, and I'm the only one looking at that direction. Í was shouting to the driver to stop the car but it was impossible to do it because we were driving on the highway with other cars and vehicles around. The shape of the object was round and had no sharp edges, it was kind of blurred. The color was orange glowing and it was pretty big to."
So you saw the reflection of a sign or something orange in the car being reflected on the object.
"It was raining that night so the sky was one big cloud. the objects orange light illuminated the clouds above it."
A reflection can also "filter" things being seen with different colors and patterns. You can "map" a plaid pattern on a white building, for example, if your shirt is close enough to the window.
"We were four persons in the car, but only one witness..."
This lends even more credence to it being a reflection.
Jose includes an illustration involving a "UFO" resembling the side of a quarter, which turns in a static rotation pattern as it travels across "the sky." After examining the illustration, I deduced that it is extremely possible that the "UFO" is actually a reflection of a certain type of hubcap on somebody's car, or the wheels on a semitrailer. If you have a shiny metal hubcap with just the right shape to it, and if an orange light from a sign or a car hits it just right, the reflection will rotate in exactly the way described.