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100+ Free China Truck Subject 4 Practice Questions

Prepare for the China Commercial Vehicle Driving Test Subject 4: Safe and Civilized Driving (大型客货车科目四安全文明驾驶常识) exam with instant access — no signup required.

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2026 Statistics

Key Facts: China Truck Subject 4 Exam

50 Questions

Official computerized exam length (2 points per question)

Ministry of Public Security (MPS) Order 162

90% Pass Mark

Requires ≥90/100 points (maximum 5 mistakes allowed)

PRC Motor Vehicle Driving Examination Standards

45 Minutes

Official examination time limit on computer terminal

MPS Vehicle Administration Office (车管所)

150+ Meters

Mandatory warning triangle placement distance on expressways

PRC Road Traffic Safety Law Implementation Regulations Art. 52

< 0.55 MPa

Pneumatic air brake low pressure emergency warning threshold

GB 7258-2017 Motor Vehicle Safety Technical Conditions

China's Driving Subject 4 for heavy trucks is the final computerized theoretical barrier before commercial driver license issuance (Classes B2 and A2). Candidates must achieve at least 90/100 points on a 45-minute 50-question test covering mountain grade engine braking, escape ramps, trailer jackknife recovery, air brake drop procedures, blind spots, and hazardous cargo emergencies. This 100-question OpenExamPrep bank provides an English-language study adaptation with exact legal citations to MPS Order 162 and GB standards.

Sample China Truck Subject 4 Practice Questions

Try these sample questions to test your China Truck Subject 4 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1When a heavy rigid truck or articulated combination vehicle makes a right turn at an urban intersection, what primary factor creates the hazardous right-side blind spot often referred to as the 'Death Zone' (死亡盲区)?
A.The inner wheel difference (内轮差), where the rear wheels follow a significantly tighter turning arc than the front steering wheels
B.The aerodynamic downforce created by the front bumper deflecting side airflow
C.The pneumatic brake lag between the foot valve and the trailer relay valve
D.The reflection of the curb mirror distorting distance perception in direct sunlight
Explanation: Under Chinese commercial vehicle safety training standards (GA 1026-2017), the right-side blind spot of large trucks during right turns is primarily driven by the inner wheel difference (内轮差). Because the rear fixed axles track inside the path of the front steering wheels by up to 1.5 to 2.5 meters, pedestrians and non-motorized riders who appear clear of the cab can be crushed by the trailer rear wheels. Heavy truck drivers must stop or yield, check Class IV/V mirrors, and ensure the entire sweeping envelope is clear.
2How does vehicle wheelbase (轴距) affect the inner wheel difference (内轮差) and turning radius when operating a heavy commercial truck?
A.A longer wheelbase produces a larger inner wheel difference, requiring a wider outward swing before turning
B.A longer wheelbase reduces the inner wheel difference, allowing tighter turns near the curb
C.Wheelbase length has no mathematical relationship to inner wheel difference, which is governed solely by tire width
D.A shorter wheelbase requires the driver to cross oncoming lanes to avoid curb contact
Explanation: In vehicle dynamics and GB 7258-2017 operating standards, inner wheel difference is directly proportional to wheelbase: the longer the distance between the front steering axle and the rear fixed axles, the greater the offset between the front and rear wheel tracks. Consequently, long-wheelbase rigid trucks and semi-trailers require a larger outward turning radius and late steering apex to prevent the rear tires from mounting curbs or striking roadside barriers.
3According to GB 1589-2016 regulations on axle loads and vehicle dimensions, what is the primary risk of loading cargo too far toward the rear of a heavy truck cargo bed?
A.It reduces downforce on the front steering axle, leading to degraded steering control and headlight upward mispointing
B.It causes immediate pneumatic failure of the service brake dual-circuit diaphragm
C.It locks the transmission inter-axle differential into permanent 4-wheel engagement
D.It increases front tire temperature and accelerates front tread wear
Explanation: Under GB 1589-2016 and safe loading guidelines, loading cargo excessively toward the rear shifts the center of gravity behind the rear axle fulcrum, levering weight off the front steering axle. This severely reduces front tire traction, causing dangerous understeer or complete loss of directional steering control at highway speeds, while elevating the vehicle front and blinding oncoming drivers with misaligned headlights.
4When securing palletized heavy goods on an open flatbed cargo truck, which of the following restraint practices is required under PRC Road Freight Transport Safety Regulations?
A.Using certified ratchet tensioners, tie-down straps, and high-friction rubber dunnage mats across all cargo units
B.Relying solely on the vehicle's side dropsides without additional top-over lashings
C.Securing only the rearmost pallet and leaving intermediate pallets free to settle naturally
D.Tying cargo exclusively with natural hemp ropes secured directly to the wheel rims
Explanation: Under the Ministry of Transport Regulations on Road Freight Transport Safety, heavy freight on flatbeds must be immobilized against longitudinal braking forces (0.8g forward) and lateral centrifugal forces (0.5g lateral). Certified synthetic web tie-downs with ratchet tensioners combined with high-friction anti-slip dunnage mats prevent cargo shifting, balance axle loads, and prevent cargo loss on high-speed roadways.
5When backing a semi-trailer combination vehicle (重型半挂车) into a narrow loading dock, how must the driver initially manipulate the steering wheel to guide the rear of the trailer to the left?
A.Turn the steering wheel to the right initially, then counter-steer to the left once the trailer begins pivoting
B.Turn the steering wheel immediately to the hard left and hold it stationary throughout the maneuver
C.Engage the differential lock and accelerate briskly in reverse without steering inputs
D.Pump the service brake pedal continuously while keeping the steering wheel centered
Explanation: In articulated commercial vehicle dynamics (GA 1026-2017 Subject 2 and Subject 4 syllabi), backing requires reversed steering geometry. To push the trailer rear to the left, the tractor front must steer to the right so that the tractor rear swings right, articulating the fifth wheel kingpin. Once the trailer is angled toward the dock, the driver counter-steers left to 'follow' and catch the trailer to prevent jackknifing.
6Why are liquid tanker trucks (液体罐车) operating with half-empty compartments (30%–70% capacity) exceptionally susceptible to rollover during curve negotiation?
A.Liquid sloshing creates a dynamic lateral surge (液体晃动冲击) that drastically shifts the vehicle's center of gravity toward the outside of the turn
B.The remaining air in the tank creates a vacuum that collapses the tank baffles onto the rear axle
C.Partial liquid loads disable the pneumatic anti-lock braking system (ABS) wheel speed sensors
D.The lower weight increases engine turbocharger boost beyond the transmission's torque limit
Explanation: Under GB 7258-2017 and liquid transport safety principles, partially filled tanker compartments allow the free liquid mass to surge laterally under centrifugal acceleration. This 'free surface effect' shifts tons of mass outward and upward, amplifying the rollover moment and causing vehicle rollover at cornering speeds significantly below the threshold of a fully loaded or solid-cargo truck.
7When operating a high-cube van truck or double-deck commercial vehicle transporter with a high center of gravity (高重心), what is the safest driving strategy when entering an expressway interchange ramp?
A.Reduce speed well before the ramp entrance curve, maintain a smooth steady arc, and avoid abrupt steering or braking
B.Maintain highway cruising speed until reaching the curve apex, then apply emergency braking
C.Coast through the curve in neutral to allow the high center of gravity to self-stabilize
D.Accelerate sharply through the curve to generate downward aerodynamic downforce
Explanation: High center of gravity vehicles have a narrow lateral stability margin. Centrifugal force increases with the square of vehicle speed (F = m * v^2 / r). Under GA 1026-2017 safe driving guidelines, drivers must decelerate in the straight deceleration lane before curve entry, maintain gentle steering inputs, and avoid sudden mid-corner weight transfers that can trigger rollover.
8Under Ministry of Public Security Order No. 162 and the PRC Road Traffic Safety Law, what are the maximum continuous driving hours and minimum mandatory rest duration for heavy commercial vehicle drivers?
A.Maximum 4 hours of continuous driving, followed by a mandatory rest stop of at least 20 minutes
B.Maximum 6 hours of continuous driving, followed by a mandatory rest stop of at least 10 minutes
C.Maximum 8 hours of continuous driving, followed by a mandatory rest stop of at least 15 minutes
D.Maximum 5 hours of continuous driving, followed by a mandatory rest stop of at least 30 minutes
Explanation: Article 62 of the Road Traffic Safety Law Implementation Regulations and MPS Order 162 explicitly stipulate that drivers of medium and heavy passenger and freight vehicles must not drive continuously for more than 4 hours without stopping for rest, and each rest period must be no less than 20 minutes. Violations on expressways result in severe penalty point deductions under MPS Order 163.
9According to Article 78 of the PRC Road Traffic Safety Law Implementation Regulations, what are the lane usage and maximum speed rules for heavy goods trucks on expressways?
A.Heavy trucks must operate in the right-hand designated lane(s) and must not exceed a maximum speed of 100 km/h
B.Heavy trucks may cruise indefinitely in the far-left overtaking lane at speeds up to 120 km/h
C.Heavy trucks have unrestricted lane choice and are exempt from posted expressway minimum speed limits
D.Heavy trucks must drive on the emergency shoulder whenever their speed falls below 90 km/h
Explanation: Article 78 of the Implementation Regulations specifies that on expressways, heavy goods vehicles and combination vehicles are restricted to the designated right-hand travel lanes. Their maximum statutory speed limit must not exceed 100 km/h, regardless of whether passenger car lanes permit 120 km/h. Left lanes are strictly reserved for overtaking or passenger vehicles.
10What is 'tail swing' (尾摆 / 后悬外摆) in heavy commercial vehicles, and when does it pose the greatest danger?
A.The outward sweep of the vehicle's rear overhang on the opposite side of a turn when pulling away from curbs, walls, or parked vehicles
B.The lateral vibration of the drive axle caused by an unbalanced driveshaft at highway speeds
C.The vertical oscillation of the rear air suspension when dumping cargo from a tipper truck
D.The aerodynamic buffeting of the rear mudflaps in heavy crosswinds
Explanation: Tail swing occurs because the portion of the truck body extending behind the rear axle (the rear overhang / 后悬) pivots outward in the opposite direction of the front steering angle. When a driver steers sharply away from a curb, loading bay, or adjacent vehicle, the rear tail can swing out 0.5 to 1.0+ meters, striking nearby objects or pedestrians if the driver fails to check mirrors before turning.

About the China Truck Subject 4 Exam

The China Commercial Vehicle Driving Test Subject 4 (科目四, officially 安全文明驾驶常识考试) is the mandatory final theoretical examination for obtaining heavy commercial driving licenses, including Class B2 (Large Trucks) and Class A2 (Tractor-Trailers). Administered nationwide by the Ministry of Public Security Traffic Management Bureau, the test evaluates critical professional competencies: heavy truck dynamics, pneumatic brake failure recovery, retarder and exhaust braking on long mountain descents, runaway truck escape ramp navigation, tire blowouts, jackknifing, bridge crosswinds, fire suppression, emergency expressway warning placement, and hazardous freight initial response under GB 7258, GB 1589, and MPS Order 162. Officially delivered in Chinese, this OpenExamPrep resource provides an English-language MCQ study adaptation.

Assessment

50 computer-based questions including single-choice, multiple-choice, true/false judgment, and video hazard animation scenarios. Scoring requires 90/100 points (maximum 5 mistakes allowed) within 45 minutes.

Time Limit

45 minutes

Passing Score

90% (90 out of 100 points, max 5 errors allowed)

Exam Fee

Included in standard commercial driver licensing tuition (re-test fee ~RMB 30–50) (Ministry of Public Security Traffic Management Bureau (公安部交通管理局 / 车管所))

China Truck Subject 4 Exam Content Outline

20%

Heavy Vehicle Safe Operations & Dynamics (大型货车安全行车基础与盲区管理)

Inner wheel difference (内轮差), right-side blind spot ('Death Zone' 死亡盲区), high center of gravity stability, cargo securing and lashing, axle load distribution (GB 1589), fifth wheel coupling, and fatigue driving regulations (MPS Order 162)

30%

Adverse Weather & Mountain Grade Driving (恶劣天气与山路长下坡驾驶)

Continuous mountain descent exhaust brake/retarder operation, brake thermal fade prevention, runaway truck emergency escape ramps (避险车道), strict prohibition of neutral coasting, bridge crosswinds, and tire chain usage on snow/ice

25%

Truck Emergency Handling & Malfunction Recovery (突发紧急情况临危处置)

Pneumatic air brake pressure drop (<0.55 MPa), tractor-trailer jackknifing recovery, front vs. rear tire blowouts, wheel hub and engine compartment fires, power steering failure, and throttle stick recovery

25%

Crash Scene Management & Freight Hazards (事故现场处置与货物安全常识)

Expressway breakdown warning placement (150m+), driver evacuation behind outer guardrails (车靠边、人撤离、即报警), trauma first aid, spilled freight containment, and initial hazmat tanker incident notification

How to Pass the China Truck Subject 4 Exam

What You Need to Know

  • Passing score: 90% (90 out of 100 points, max 5 errors allowed)
  • Assessment: 50 computer-based questions including single-choice, multiple-choice, true/false judgment, and video hazard animation scenarios. Scoring requires 90/100 points (maximum 5 mistakes allowed) within 45 minutes.
  • Time limit: 45 minutes
  • Exam fee: Included in standard commercial driver licensing tuition (re-test fee ~RMB 30–50)

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

China Truck Subject 4 Study Tips from Top Performers

1Memorize the long downhill rule: Never coast in neutral (严禁空挡滑行) and never rely solely on service brakes. Always select a low gear and engage the exhaust brake or hydraulic retarder to prevent brake thermal fade (制动器热衰退).
2Understand escape ramp navigation: When brakes fail on a mountain grade, identify the emergency escape ramp (避险车道), steer straight into the center of the gravel arrester bed, and do NOT make sharp steering turns or swerve away.
3Master tire blowout procedures: For a front tire blowout, grip the steering wheel firmly with both hands, ease off the accelerator, gently guide the vehicle straight onto the shoulder, and strictly NEVER slam the brakes (严禁紧急制动) which causes immediate rollover.
4Know expressway emergency protocols: Follow the 'Nine-Word Mantra' (车靠边、人撤离、即报警 - Pull aside, Evacuate people, Report immediately). Place the warning triangle at least 150 meters behind the truck on expressways, and ensure all occupants evacuate beyond the outer steel guardrails.
5Remember pneumatic air brake thresholds: If air pressure drops below 0.55 MPa (5.5 bar), the low pressure alarm sounds. Stop immediately in the emergency lane before the spring parking brake (断气刹) automatically locks the wheels.

Frequently Asked Questions

What is China's Driving Test Subject 4 (科目四)?

Subject 4 (officially 安全文明驾驶常识考试 - Safe and Civilized Driving Knowledge Test) is the final theoretical examination required to obtain a motor vehicle driving license in China. For heavy truck categories (Class B2 Large Trucks and Class A2 Tractor-Trailers), it evaluates critical safety competencies including mountain driving, auxiliary braking, escape ramp use, emergency blowout recovery, and hazardous cargo response.

What is the format and passing score for Subject 4?

The official test consists of 50 computerized questions (single-choice, multiple-choice, and true/false judgment, worth 2 points each) to be completed within 45 minutes. A minimum score of 90 out of 100 points (at least 45 correct answers) is required to pass. The test terminates immediately if 6 mistakes are made.

What are the core technical regulations tested for heavy trucks in Subject 4?

The exam heavily tests provisions from Ministry of Public Security Order No. 162, the PRC Road Traffic Safety Law Implementation Regulations, GB 7258-2017 (Technical Specifications for Safety of Motor Vehicles), and GB 1589-2016 (Vehicle Dimensions and Axle Load Limits), with special emphasis on auxiliary braking (retarders), runaway escape ramp procedures, and pneumatic brake loss recovery.

What happens if a candidate fails Subject 4?

Candidates who fail the 50-question computer test are entitled to one immediate free retake on the same sitting. If they fail the retake, they can schedule an appointment to re-sit Subject 4 as many times as needed within the 3-year validity period of their Driving Skills Certificate (学习驾驶证明) without needing to re-test Subjects 1, 2, or 3.

What is the English-language study adaptation on OpenExamPrep?

While the real examination in China is administered exclusively in Chinese on official testing terminals, OpenExamPrep provides this 100-question English study adaptation with bilingual technical terms (such as 内轮差, 避险车道, 缓速器, 断气刹) to help international professional drivers, commercial logistics operators, and safety managers master Chinese heavy vehicle traffic standards.