WIDEBODY FLT CREW DISCOVERS AFTER LANDING RWY 17L AT DFW AND SOUTH ON TXWY Q THAT TXWY ER IS CLOSED TO WIDEBODY ACFT. FLT CREW IS ALLOWED TO CONTINUE BEHIND FOLLOW ME VEHICLE.

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AFTER REPEATED REQUESTS FOR LNDG ON WEST SIDE WE WERE CLRED FOR RWY 17L. DURING APCH IT WAS CLR CTLR TRAINING WAS IN PROGRESS. WE MADE 3 RADIO CALLS TO TWR BEFORE WE GOT A RESPONSE ON FINAL AND COULD HEAR SUPVR TELLING CTLR WHAT TO SAY IN BACKGROUND ON RADIO. LANDED ON RWY 17L ROLLED OUT TO HIGH SPD EXIT TXWY Q7 AND CONTINUED ROLLOUT ONTO TXWY ER AS LNDG ACFT IN FRONT OF US HAD DONE AND IS NORMAL TAXI FLOW FOR TAXI TO WEST SIDE OF THE ARPT. A WE EXITED THE RWY AND WERE COMMITTED TO TXWY ER. WE RECEIVED TAXI INSTRUCTIONS TO TURN RIGHT ON TXWY Q AND GO NORTH TO TXWY EL AND HOLD SHORT OF RWY 17C WHICH WE WERE ABLE TO COMPLY WITH. AS WE ENTERED TXWY ER WE WERE TOLD TO STOP AS TXWY ER WAS RESTRICTED TO WIDEBODY ACFT. WE CHKED ALL MESSAGES; ARPT NOTAMS; AND ALSO ATIS AND NO MENTION OF THIS RESTRICTION IN ANY OF OUR PAPERWORK. WE SAT APPROX 5 MINUTES ON TXWY ER BEFORE A FOLLOW ME VEHICLE USHERED US AHEAD TO CROSS RWY 17C AND RWY 17R. THIS WAS AN AREA OF TXWY SHOULDER CONSTRUCTION FOR PENDING NEW BYPASS TXWY AROUND THE DEP END OF RWY 17C AND RWY 17R. ALL HARD SURFACE TXWY WAS IN PLACE WITH CONES OUTLINING THE SHOULDER WORK. TALKED TO DISPATCHER; AND HE ALSO CONCURRED HE HAD NO NOTAM INFO ON WIDEBODY RESTRICTION ON THIS TXWY. HE ADVISED HE CALLED TWR AND TALKED TO SUPVR. HE SAID THAT THEY HAD NO PROBLEM WITH OUR OPERATION BUT THEY HAD PUT NOTAM INFO OUT ABOUT THE RESTRICTION. DISPATCHER PUT OUT NOTICE FOR ANOTHER FLT IN CASE THEY WERE GIVEN RWY 17L ALSO PLUS WAS SENDING INFO TO OPS TO INCLUDE IN NOTAMS.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE REPORTER STATED THAT IT IS UNUSUAL FOR WIDEBODIES TO LAND ON RWY 17L AND HAS NOT USED IT SINCE HIS REPORT. THE CONSTRUCTION IS STILL UNDERWAY AND THERE IS STILL NO NOTAM CONCERNING THE RESTRICTION ON TXWY ER.