BTX - Motor expenses how do you treat them when working out the adj net profit?

Hello,

Just had a look at a question in Kaplan but no where in the tutorial which i can see do they have any info on this.

"Motor expenses included the running costs of:

Delivery vans - £22000
Sales Representative car - £10000
Joesph car which is 50% used for private mileage - £6000"

All they have added back on £3000.

So does this mean the only motor expenses which are not allowed during this calculation is personal expenditure for motors?

Thanks