 Although the portion from the United States–Mexico border to FM 1472 is officially an extension of SH 255, it is still signed in the field as FM 255.Beginning June 1, 2009, the use of the TxTag electronic toll collection system (or the interoperable EZ TAG and TollTag system) was mandatory; unlike other TxDOT-operated toll roads, there was no pay-by-mail option, although the option to set up a prepaid day pass account was provided.Motorists were also able to use Laredo Trade Tags if they were connected to a TxTag account.