Six people have been arrested on suspicion of entering the UK illegally after an Italian-registered lorry was stopped on the A27 near Chichester.
Police were called after the driver heard banging from inside the lorry yesterday.
The westbound carriageway was closed for around half an hour as a rolling road block was put in place, just in case any of the people attempted to run.
The men, aged between 23-29 have been arrested and remain in custody.
They will be interviewed by UK Border Agency staff later this morning.