Bridge railing on any Texas bridge must connect with roadside metal beam guard fence if it is present. TxDOT provides railing transition details in the TxDOT Design Division Roadway Standards and transition connection details in the TxDOT Bridge Division Bridge Standards. Select the transition appropriate for the speed. Speeds of 50 mph and above require a TL-3 transition. Speeds of 45 mph and below can use a TL-2 or TL-3 transition.