Dangerous passing trucks at any time.

Here in Oz they generally wind up to 100 kph on the open road and foolish to try passing them, before you know it they will be sitting on your rear bumper, a UHF radio is vital for safety, to talk to them and help them past if they come up behind, usually the reply is favorable, they are good guys just doing their job and establishing dialogue with them works wonders.

Just stay on channel 40.

Bevan