The University of Texas at Dallas physics department has studied and explained the so-called Marfa Lights.
From the publication:
The publication can be found in this .pdf file.
From the publication:
All of the mystery lights observed by this group on the nights of 11 and 13 May 2005 can be reliably attributed to automobile headlights traveling along US 67 between Marfa and Presidio, TX.
The publication can be found in this .pdf file.