There's a row at Dublin Bus over a ban on drivers listening to the radio. Some drivers will refuse to use the Port Tunnel next week because they say they need their radios in case of an emergency.

If a driver's listening to a station, emergency services can interrupt that signal and contact a driver directly over the FM band. The National Bus and Rail Union also says the tunnel is frequently on lock-down because of a crash, and the radio is important for traffic and news updates.

The boycott will take place from Tuesday (the same day as the next Luas strike) and could result in delays to passengers. The routes affected are the 33d, 33x, 41x, 142 and Airlink 747.

The radio ban is part of a new zero tolerance policy by Dublin Bus which has angered members of the NBRU. The union has written to Dublin Bus about the move and says it has advised members not use the tunnel for health and safety reasons.