Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Communication Breakdown
Conflict Ground Conflict; Critical; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Ground Equipment Issue; Ground Event / Encounter Vehicle
Flight Crew Requested ATC Assistance / Clarification; Flight Crew Took Evasive Action
Airport; Procedure
While taxiing outbound a tug vehicle crossed our taxiway and failed to yield. We had discussed this as a threat and common area for vehicles to do this. This vehicle tug had plenty of time to stop and ran the stop sign to cross in front of us on Taxiway A. I had to brake hard to avoid collision with the vehicle and the aircraft stopped approximately 10 feet from the roadway crossing with the tug directly off the nose. I notified Ground of the incident.Vehicle drivers operating recklessly and failing to yield right of way to aircraft on taxiways. Install cameras and enforce violations of vehicle operators who risk the safety of aircraft while taxiing.
Air Carrier Captain reported tug failed to yield while taxiing; resulted in hard braking to avoid collision at ORD airport.