James Richards:
If static on the motorway for an hour or more I would say you are not free to dispose of your time and could not unwind or relax by constantly checking if the traffic is on the move again.
But a good point raised by the OP, if you fell asleep on the bunk and the road was cleared ,you could wake up in a live lane with the traffic buzzing past .
Being free to dispose of your time is not a requirement when taking a Break (although it is for Rest periods).
To be honest, I’d suggest keeping an eye on the traffic to see when it starts moving again is on a par with keeping an eye/ear on loading bay activity while they tip you. In both situations it’s engine off, and time for playing on the phone, reading the paper or just watching the world go by - ie a break from driving or working.
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