Northlake isn’t really a town, just a patchwork of annexed farmland straddling I35W between Denton and Southlake, but they do have a police “department” and a municipal court. Their police cruiser (we’ve only ever seen one) frequently parks along the interstate between Crawford Rd. and FM 1171. Since nothing that happens on this rural stretch of I-35 could possibly impact anyone in the “town” of Northlake (because there isn’t one), you can make the reasonable assumption that it’s all about generating ticket revenue. This seems to be prevalent in Texas, with its baffling myriad of jurisdictions and “home rule” regarding speed limits and traffic fines. Be careful.