Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Confusion; Situational Awareness; Human-Machine Interface; Distraction
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Taxiway
Air Traffic Control Provided Assistance; Flight Crew Returned To Clearance
Airport; Environment - Non Weather Related
We landed 31R in DAL and exited runway at M5; Ground issued B to D to the gate. We made turn onto M. Ground caught the error and issued new clearance 'M B5 ramp'. There was an Operations vehicle on the frequency and Ground asked him to look at the signage at M/M5 intersection; Ground stated we were the fourth aircraft to make the same error and he didn't want to file a deviation if it was a signage issue. The Operations vehicle stated that there was a sign for M but it was on M5 as you leave the runway; if you didn't see it exiting the runway there is no indication of M versus B. I had my iPad on and it automatically changed to 10-9 on landing. We had originally briefed 31L; but it closed when we were in the descent.
Air carrier Captain reported taxiway incursion at DAL airport and cited signage issues as a contributing factor.