Driving we saw a long, skinny rectangle of doubled up lights in the sky. It appeared for several minutes.

We were driving down the road, and out of nowhere a long skinny rectangle of lights appeared in the sky. First I thought it was the tail of a huge fireball or meteor, but the more I looked at it the more it remained stationary and unchanging in the sky. Almost like an LED strip, with lights doubled up. Very shimmery, sparkley, not moving or changing in any way. In the sky it was about the size of a pinky finger. We were on a mountain road and it took a few minutes to safely pull the car over, and it remained unchanging for that duration, for approximately two or three minutes. As I got out of the car, it disappeared in place. I can't quite remember if it faded out slowly or if i was just straining to see it, but it was gone quickly, never moving. Several other cars (maybe 4?) also pulled over abruptly, I assume for the same reason.
I am generally a logical, skeptical person, and have been looking online at commonly mistaken UFO's (i.e. satellites, atmospheric balloons, fireballs, etc.) and nothing looks like this. I understand that the Star Link satellites were recently launched, but this looks nothing like that. The lights were packed closely together (for example it would be a light, then an open space the size of the light, then another light) It reminded me more of an LED strip of lights packed closely together, and maybe doubled or tripled up. It was beautiful and sort of glimmery or sparkley.
My partner was driving at the time and we both saw the same thing. We were on a remote stretch of highway, clear and bright night sky, no moon or city lights.
Please let me know if you have any questions! Thanks for your work on this stuff!