Robharris999
The purpose of a Rudder Travel Limiter is exactly that. As airspeed increases (computed by the air data system) the amount of rudder travel permitted is limited. This prevents excessive loading on the tail structure at high speeds.
If the Rudder Travel Limiting system were to fail, then the travel should be limited at it's last setting eg. if it failed at high speed it would limit to the high speed setting until slats were selected to 'out'.
If the system were to receive incorrect airspeed through the air data system however (due to probe icing??) the rudder travel limiter may be set to allow more travel due to the incorrect computed airspeed vs the actual airspeed. This could mean that the vertical stabilizer might receive excessive structural loading.
MLT