Truck & Bus Theory IrelandProfessional licences in Ireland split by vehicle. Category C is trucks. Category D is buses. Both theory tests are 100 questions in 120 minutes with a 74 pass mark. Drivers who carry goods or passengers for a living also sit Driver CPC case studies. Tachograph and drivers’ hours sit in the truck bank; carrying passengers sits in the bus bank.
| Licence you want | Theory test | Also |
|---|---|---|
| Category C (truck) | 100-question truck theory | Driver CPC case studies if you will drive for a living |
| Category D (bus) | 100-question bus theory | Driver CPC case studies, plus passenger rules |
| Already hold C or D and need CPC | The matching case-study paper | Periodic CPC training is separate from these theory papers |
Car and motorcycle theory is in the car and motorcycle theory guides. The instructor route is in the ADI guides. A short sample is on the free practice quiz.
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The truck theory test
Category C format and marks, eligibility, and how the theory test fits the Driver CPC route.
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The Driver CPC case study test (truck)
Three case studies, 45 questions, two pass conditions you must clear at the same time.
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Tachograph and drivers’ hours
The heaviest topic in the category C test, and why reading a chart is a skill you have to practise.
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What to study for the truck test
Where the weight sits across seven topic areas, and a plan for a two-hour paper.
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The bus theory test
Category D format and marks, the age-21 rule, and how the theory test fits the CPC route.
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The Driver CPC case study test (bus)
Three case studies, 45 questions, and two pass conditions you must clear at once.
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Carrying passengers safely
The largest topic in the category D test, and the one with no car-driving equivalent.
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What to study for the bus test
Where the weight sits across seven topic areas, and a plan for a two-hour paper.
Practise the real test shape
Truck & Bus Theory Ireland turns this material into practice: full 100-question category C and D mocks, the truck and bus module tests, the combined CD paper, and 45 Driver CPC case studies marked on both pass conditions.
Independent guide: TritonApps is not affiliated with, endorsed by, or approved by the Road Safety Authority or the Driver Theory Test service. This page summarises published guidance for convenience and is not official advice. Always confirm current requirements and fees with the RSA before you book.