Two truck drivers have been arrested as police continue their crackdown on speeding heavy transports on the Hume Highway.

Police have stepped up their patrols and mechanical checks after the deaths of three people killed by an out of control truck at Menangle, and a string of incidents where speed limiters have been tampered with.

In the latests incidents two drivers have been detained at Gunning near Goulburn.

One driver was doing 124 and the other 129KPH.

They were supposed to be doing no more than 100.

Police have also ordered the speed limiters on both trucks be inspected within seven days.

Both drivers have also been fined more than $400 each.