Oman Heavy Vehicle Theory flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Oman default speed limit

In Oman, the default urban speed limit is 60 km/h and the default rural or highway limit is 90 km/h unless posted signs state otherwise. Heavy vehicles may have lower limits.

Red traffic light

A steady red signal means stop before the stop line and remain stationary until the signal changes. Do not proceed even if the road appears clear.

Give way sign

An inverted triangle sign with a red border means yield to traffic on the priority road. Stop if necessary and proceed only when the way is clear.

Solid white centre line

A continuous solid white line means no crossing or overtaking. You must stay in your lane and must not pass other vehicles across the line.

Roundabout priority

At a roundabout, traffic already circulating has priority. Heavy vehicles should choose the appropriate lane in advance, signal correctly and yield before entering.

Tyre tread minimum

Heavy vehicle tyres typically require a minimum tread depth of 1.6 mm across the central three-quarters of the tread. Check for cuts, bulges and correct cold pressure.

Daily walk-around check

Before departure, check tyres, lights, mirrors, wipers, horn, fluids, leaks, brake function and load security. Record any defects and rectify safety-related faults before driving.

Air brake pressure range

Air brake systems normally operate at about 6–8 bar (90–120 psi). Build full pressure before driving and investigate any low-pressure warning.

Air brake leak test

With the engine off and system charged, apply and hold the foot brake. Pressure loss should not exceed about 0.2 bar (3 psi) per minute.

Brake fade on descents

Continuous service brake use on long descents overheats linings and causes fade. Use lower gears and engine braking to control speed instead.

Spongy brake pedal

A spongy or soft hydraulic brake pedal usually indicates air in the system or a fluid leak. Bleed the system and inspect lines before driving.

Hydraulic brake fluid check

Check the brake fluid reservoir level regularly. A low level indicates a leak or worn pads. Use only the manufacturer-specified fluid and replace at recommended intervals.

Gross vehicle weight

GVW is the maximum permitted total weight of the vehicle including load, fuel and occupants. It must not exceed the plate rating or posted road limits.

Load centre of gravity

Keep the load low and centred to maintain stability. Heavy loads should sit over or slightly ahead of the rear axle group to preserve steering grip.

Load securing check

Secure every load with rated lashings, chains or straps. Re-check tension after the first few kilometres and after rough terrain or sudden braking.

Vehicle height awareness

Know your vehicle's height and check bridge, tunnel and canopy clearance signs. If in doubt, stop and verify rather than risk a collision.

Off-tracking on turns

Long vehicles cut inside the front wheel path on turns. Allow for rear wheel off-tracking and tail swing when turning near kerbs, poles or other vehicles.

Desert heat tyre risk

High desert temperatures raise tyre pressure and blowout risk. Check pressures when cold, inspect for damage and reduce speed on hot roads.

Aquaplaning response

If the vehicle aquaplanes on wet roads, ease off the accelerator, hold the steering steady and avoid sudden braking until grip returns.

Flash flood hazard

Wadis can flood suddenly after distant rain. Never drive into flowing water of unknown depth; turn back and find an alternative route.

Fatigue break rule

Take a break at least every two hours of driving, or sooner if tired. Stop in a safe place and rest; fresh air and coffee are not substitutes for sleep.

Alcohol and driving

Alcohol slows reaction time, reduces coordination and impairs judgement. Driving under the influence is a criminal offence with severe penalties including imprisonment.

Two-second rule

Maintain at least a two-second gap behind the vehicle ahead in good conditions. Double the gap in rain, at night or when following a heavy vehicle.

Stopping distance and speed

Stopping distance increases with the square of speed. Doubling speed roughly quadruples the distance needed to stop, so reduce speed early.

Hazard scanning

Scan 12–15 seconds ahead and check mirrors regularly. Identify side roads, pedestrians, animals and parked vehicles early to allow a safe response.

Incident scene safety

At an incident, stop, switch off the engine, set hazard lights and place warning triangles. Call emergency services on 9999 in Oman before assisting.

CPR initiation

If a casualty is unresponsive and not breathing normally, begin CPR if trained. Check responsiveness, breathing and circulation and keep the person warm.

Bleeding control

Control severe bleeding by applying direct pressure with a clean cloth or dressing. Keep the casualty still and do not give food or drink.

Tachograph record keeping

Record driving, other work, availability and rest accurately. Keep records for the legally required period and present them on request. Tampering is an offence.

45-minute driving break

After 4.5 hours of driving, take a break of at least 45 minutes. This may be split into 15 minutes followed by 30 minutes.

Daily rest requirement

Daily rest must normally be at least 11 hours, reducible to 9 hours up to three times a week. Weekly rest rules also apply and must be recorded.

Low-pressure warning

An air brake low-pressure buzzer or lamp warns that system pressure is unsafe. Stop, investigate and build pressure before continuing; never ignore the warning.