The Road Safety Authority is urging anyone with a driving test booked for next Wednesday afternoon to rebook it due to srike action.
The trade union IMPACT says all driving testers will down tools from 2 o'clock on April 2nd, in a row over the hiring of new staff.
The RSA says it's extremely disappointed with the stance taken by IMPACT - and says it's acting in accordance with the Labour Court.
But Assistant General Secretary Denis Rohan says their hands are tied;
