Gents, may I ask you a stupid question?
I am sort of clear on driving and working times regarding double-manned vehicles.
Let’s take the thing a bit further and assume I want to delight important long-term customer and ship a load across Europe as quickly as possible and also want to improve utilization rate of the vehicle.
Suppose I have a truck with big cab (e.g. Scanie EXC) fitted with three seats and three bunks and I do fit in three drivers.
While two of them are carrying out their duties as a typical two-man crew, can the third man on the vehicle claim this time as his rest period?
The rules do not say the rest can not be taken on a moving vehicle. They only say:
“A rest is an uninterrupted period where a driver may freely dispose of his time.”
“During break, drivers may not carry out any driving or any other work. Break periods are used exclusively for recuperation.”
And as of travelling the rules say:
“the time the driver spends travelling … may not be counted as a rest or break, unless the driver is in a ferry or train and has access to a bunk or couchette.”
Well, the third driver has an uninterrupted time period during which he can not drive or do any other work. He is not on a train or a ferry, but is on a vehicle and has access to bunk. Also has an acess to TV, PC, newspaper, can do some simple physical exercise (as far as the cab allows) so can really use the time for recuperation.
I guess it comes to the point when we need clarification of the “must be able to freely dispose of his time”.
Taking the rest at motorway services you can not really “freely dispose of your time” either…
I think I just saw this on the free VOSA DVD 
Lets see if I remember correctly - the other driver(s) can take a break, not daily rest, in a moving vehicle but all drivers can have same 11 hour (don’t think 9 is allowed but stand to be corrected) daily rest and the working day can be 21 hours followed by the 11 ? daily rest
Now lets see if I get shot - again 
The regulations do not permit you to take your daily rest in a moving vehicle, so you’re out of luck I’m afraid.
Specifically, paragraph 8 of article 8 of the regulations states:
Where a driver choses to do this, daily rest periods and reduced weekly rest periods away from base may be taken in a vehicle, as long as it has suitable sleeping facilities for each driver and the vehicle is stationary
Paul
ROG:
I think I just saw this on the free VOSA DVD
Lets see if I remember correctly - the other driver(s) can take a break, not daily rest, in a moving vehicle but all drivers can have same 11 hour (don’t think 9 is allowed but stand to be corrected) daily rest and the working day can be 21 hours followed by the 11 ? daily rest
Now lets see if I get shot - again
I’ll take a pot shot on the 11 Rog! 
“Where a vehicle is manned by two or more drivers, each driver must have a daily rest period of at least 9 consecutive hours within the 30-hour period that starts at the end of the last daily or weekly rest period.”
Repton’s main point is the word stationary.
So the vehicle could only move for 21 in 30 hours max. Each driver could do a max 9 driving (or maybe 10 if permitted) So the only gain in a third driver would be 1-3 hours extra driving. (have I got that right or do I get shot too? )