Police have arrested two illegal immigrants understood to have jumped out from the back of a lorry at Newport Pagnell service station this morning.
The lorry driver called police when he discovered the stowaways.
But the men fled, only to be spotted minutes later by another motorists on the carriageway of the M1.
The pair, whose country of origin is not yet known, have now been arrested for illegal entry into the UK.
The matter is now being dealt with by immigration authorities.