LK DMT Heavy Vehicle Written

LK DMT Heavy Vehicle Written Examination

More study resources

About this exam

The heavy vehicle written examination administered through Sri Lanka's Department of Motor Traffic (DMT) is the knowledge-testing stage for drivers seeking to upgrade an existing licence to a heavy vehicle class, typically for lorries, buses and similar large vehicles. It is aimed at drivers who already hold a lighter vehicle licence and now need to demonstrate that they understand the rules, responsibilities and risks that change when the vehicle gets bigger and heavier. The paper-based test is multiple choice and draws on the same broad subject areas as the light vehicle test, but with heavier emphasis on load security, vehicle condition, stopping distances and the duties that come with a professional driving licence. Candidates should prepare by studying the official DMT driver handbook and the current road rules, then practising sign and marking recognition until it is automatic, because many questions are answered from memory rather than reasoning. Understanding why a rule exists - especially around following distance, weight limits and defect reporting - tends to be more useful than memorising isolated facts. The DMT publishes current administrative details, so confirm fees, scheduling and pass requirements with the Department or your licensed driving school rather than relying on second-hand information.

What you'll study

Common questions

About LK DMT Heavy Vehicle Written preparation

What is the format of the heavy vehicle written test?

It is a paper-based multiple choice knowledge test, answered on a printed question sheet under supervision. You will be asked about road signs, signals and markings, driving technique, vehicle condition, safety and the rules that apply to heavy vehicles. The DMT confirms the current paper structure, so check with the Department before your test date.

How many questions are there and what score do I need to pass?

The Department of Motor Traffic sets and publishes the current question count and pass mark, and these can change. Do not rely on numbers quoted by other candidates or older study guides. Check the DMT's official channels or ask your driving school for the figure that applies to your sitting.

How long does the written test take?

The time allowance is set by the DMT and is confirmed on the day or in your test appointment information. Practise answering sign and rule questions quickly but accurately, because running out of time is a common reason for a weak result even when the candidate actually knows the material.

Can I retake the test if I fail?

Retake arrangements, waiting periods and any additional fees are set by the DMT and are not fixed for all time. Ask the Department directly about the procedure after an unsuccessful attempt. Use the gap to study the areas that caught you out rather than simply re-sitting without changing how you prepare.

How difficult is the heavy vehicle written exam compared with the light vehicle test?

Most candidates find the road rules and sign content familiar from their earlier licence test. The difference is the weight given to heavy-specific topics: load security, braking and stopping distance, vehicle inspection and defect awareness. If you prepare those deliberately, the paper is manageable; if you assume it is the same as the car test, it is not.

In what order should I study the topics?

Start with road signs, signals and markings, since they appear throughout the paper and are quick to master. Then move to driving technique and load security, followed by inspection and maintenance, hazard perception, legal responsibilities, and finally first aid and emergency procedures. Finish with practice papers under timed conditions.

What are the most common reasons candidates fail?

Weak sign and marking recognition under time pressure, guessing on load limits and load security, and misunderstanding stopping distance for a laden vehicle. Another frequent problem is skim-reading questions that contain a negative, such as asking which action is not required. Read each question twice before answering.

Do I need to know first aid for the written test?

Yes, a small share of the paper covers emergency procedures, including basic first aid and what to do at the scene of a crash. You are not expected to be a medic. Focus on scene safety, calling for help, not moving an injured person unnecessarily, and securing the vehicle and load.

Where can I confirm fees, dates and licence requirements?

Only the Department of Motor Traffic can confirm current fees, appointment dates, required documents and licence eligibility. Check the DMT's official website or visit a DMT office, and treat any figure you hear from another candidate as unverified until the Department confirms it.