Vehicle changes and analogue tachos

Can anyone tell me the correct procedure when changing repeatedly between 2 vehicles on the same day, both on analogue tachos. There is only space to fill in 2 changes on the back so should I :
a) use the first disc until it’s full, then start another.
b) use a separate disc in each truck
c) are both the above ok.

Thanks

cultivator:
Can anyone tell me the correct procedure when changing repeatedly between 2 vehicles on the same day, both on analogue tachos. There is only space to fill in 2 changes on the back so should I :
a) use the first disc until it’s full, then start another.
b) use a separate disc in each truck
c) are both the above ok.

Thanks

Use two cards - one for each vehicle and mark them card 1 of 2 and card 2 of 2 - pin both together at end of shift
For many changes between the same two vehicles that is legal and less messy

Thanks Rog, that certainly makes it easier.

The correct and legal procedure is to use a chart until there’s no more room for vehicle changes then start a new chart.