I was driving home from work on 23 south just after South Bloomfield. I was looking out the window at passing cars, just checking things out. I noticed what I thought was the top of a tower light in an odd location. As my car approached, my thought process went from tower light, to airplane, to "No it's stationary, maybe a helicopter with a search light?".
Once the three lights at each peak of the triangle was visible, it was clearly a triangle shaped something. So I try to slow down to around 45, and yes, it Is definitely a triangular shaped hovercraft-y aircraft of some sorts. The lights lit up one by one, and then pulsated, more like, peaks and then troughs. Once all the lights were lit, it glowed a bit stronger. I was watching it - slash whipping my head back to the road - in quick intrivals for quite some time.
So, naturally I get really excited, so I call someone to share the news, as I'm looking at it. I talk to him until its out over my 'trying to drive while rubbernecking' perspective, and turn shortly after that to the Court Street entrance near Sevan's. I do a u-turn and look for it, but its gone.
I drove up to Haggerty road and looked through the field and saw nothing. Afterwards, I continued home on the phone describing it, came home and drew a few sketches. I proceed to do what anyone with internet does - I googled ufo sightings and posted it here!