Sign for red-light camera at the intersection of the 610 West Loop South feeder and Westheimer Rd.  Wednesday, July 6, 2011, in Houston. The city of Houston will turn its red-light cameras back on today, Mayor Annise Parker announced after this morning's City Council meeting. According to a statement from the mayor's office, tickets will be issued after a &quot;short period of equipment testing.&quot; Houston voters approved a referendum to turn off the cameras in November, but a federal judge ruled last month that it had been improperly placed on the ballot, rendering the results invalid. As a result, the city faced a choice to turn the cameras back on or canceling its contract with American Traffic Solutions, which could cost the city $16 million. ( Melissa Phillip / Houston Chronicle ) Photo: Melissa Phillip, Staff / © 2011 Houston Chronicle