Two masked men tied up workers at the M1 toll plaza Julianstown Co Meath last night before making off with a sum of cash.
The incident happened at around 11:30 last night when the two men, one armed with a gun, tied up two employees in the cash sorting office.
About half an hour later the employees managed to free themselves and raise the alarm.
Detectives in Drogheda have appealed for anyone with information to come forward.