LK DMT Heavy Vehicle Written case studies
LK DMT Heavy Vehicle Written · Put your knowledge to work in context.
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 LK DMT Heavy Vehicle Written case studies are 5 cases and about 2,149 words.
1Articulated lorry on a steep descent with fading brakes
You are driving a three-axle articulated lorry with a fully loaded trailer, gross combination mass about 38 tonnes, down a continuous 8% descent that runs for 4 km. The road is dry, the speed limit is 60 km/h, and there is a slow vehicle lane on the right.
413 words, about 2 min2Load shift detected at a roadside check
You are carrying 22 tonnes of bagged cement on a flatbed semi-trailer. The bags are stacked 1.8 m high and covered with a tarpaulin.
471 words, about 2 min3Overtaking a cyclist on a narrow rural road at dusk
It is dusk on a two-lane rural road with a 80 km/h limit. You are driving a rigid heavy goods vehicle, 2.5 m wide, at 70 km/h.
454 words, about 2 min4Tyre blowout on a motorway with a heavy load
You are driving a loaded rigid lorry at 90 km/h in the left lane of a three-lane motorway. Without warning you hear a bang and feel the vehicle pull sharply to the left; the steering feels heavy and the vehicle begins to veer toward the hard shoulder.
436 words, about 2 min5Fatigue and a deadline on a night trunk run
You started driving at 06:00 and have now been on duty for 13 hours, including 9 hours of driving with short breaks. You have 2 hours of driving left to reach the depot, and your tachograph shows you are close to your daily driving limit.
375 words, about 2 min