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100+ Free China Bus Subject 4 Practice Questions

Prepare for the China Driver License Subject 4 Theory Test — Bus & Large Passenger Vehicle (科目四 安全文明驾驶常识 - 客车) exam with instant access — no signup required.

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2026 Statistics

Key Facts: China Bus Subject 4 Exam

90%

Passing score required on the official 50-question computer exam (90/100)

Ministry of Public Security (MPS Order No. 162)

45 Min

Official examination time limit for 50 computer-based questions

MPS Driving Examination Specification (GA 1026)

≤ 5 Errors

Maximum allowable errors; 6th error triggers immediate computer test termination

Vehicle Administration Office Examination System

刑法133条之二

Crime of Endangering Safe Driving criminalizes steering wheel grabbing and driver assaults

PRC Criminal Law Amendment (XI)

GB 7258

National safety standard mandating emergency doors, hammers, and fire extinguishers

National Standard of the PRC (GB 7258-2017)

Subject 4 for commercial passenger vehicles (A1, A3, B1) is a 50-question computer-based exam with a strict 90% (90/100) passing score and a 45-minute limit, administered by the Ministry of Public Security. This OpenExamPrep 100-question practice bank provides a verified English-language study adaptation covering passenger safety standards, emergency egress, severe weather operations, and criminal crisis deterrence.

Sample China Bus Subject 4 Practice Questions

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

1According to Article 51 of the Road Traffic Safety Law of the PRC and safety standards for passenger vehicles (GB 7258-2017), what is the mandatory pre-departure safety duty of a commercial passenger bus driver regarding seatbelts?
A.The driver must remind and ensure that all passengers have fastened their seatbelts before moving the vehicle and maintain reminders throughout the journey
B.The driver only needs to remind passengers sitting in the front row and seats next to emergency exits to wear seatbelts
C.The driver is only required to broadcast a seatbelt reminder when entering expressways or mountain roads
D.The driver does not need to verify seatbelts if the bus is equipped with passenger airbags
Explanation: Under Article 51 of the Road Traffic Safety Law and Ministry of Transport passenger transport regulations, commercial bus drivers are legally obligated to implement the 'full journey, all passengers' (全程全员) seatbelt protocol. The driver must inspect and verbally remind all passengers to properly fasten seatbelts before departing the station or bus bay and reiterate the rule throughout transit. Airbags and seat positions do not exempt any passenger from wearing safety belts.
2When pulling a city bus or passenger coach into a designated roadside bus bay (公交港湾), what is the correct civilized driving procedure?
A.Cut abruptly across the non-motorized lane and brake hard to stop right at the signpost
B.Activate the right turn signal early, yield to cyclists and pedestrians, decelerate smoothly, and align the bus parallel and within 30 cm of the curb
C.Stop in the active motorized lane 1.5 meters away from the curb to allow faster departure after passengers board
D.Honk continuously to force pedestrians and bicycles off the bay area before driving into the curb
Explanation: When approaching a bus stop bay, the driver must signal in advance, observe the right rearview mirror, yield to non-motorized vehicles and pedestrians, and decelerate smoothly. The vehicle must be brought to a halt parallel to the curb, ideally within 30 centimeters, ensuring passengers can step directly onto the sidewalk platform without stepping into active roadway traffic.
3According to Article 62 of the Regulations for the Implementation of the Road Traffic Safety Law of the PRC, which of the following rules strictly applies to passenger vehicle doors during transit?
A.Doors may remain slightly ajar on hot summer days if the air conditioning is insufficient
B.Vehicles must not be moved or driven if passenger doors are not completely closed (车门未关好不准起步)
C.Rear exit doors may be opened in advance while gliding into a bus stop to speed up passenger turnaround
D.The driver may allow passengers to push open pneumatic doors while slowing down at red traffic lights
Explanation: Article 62(1) of the Road Traffic Safety Law Implementation Regulations explicitly prohibits drivers from moving or operating a motor vehicle when doors or compartments are not fully closed ('车门、车厢没有关好时，不准起步和行驶'). Opening passenger doors before the bus has come to a complete standstill frequently leads to fatal fall accidents.
4Why must passenger bus drivers maintain exceptionally smooth acceleration, gear shifting, and progressive deceleration rather than aggressive driving dynamics?
A.Buses carry high centers of gravity and unrestrained/standing passengers whose inertia during abrupt braking or swerving causes severe fall injuries
B.Aggressive acceleration causes the bus engine transmission to automatically lock into reverse gear
C.Smooth driving is only required when transport management bureau inspectors are physically onboard the coach
D.Sudden braking reduces pneumatic air tank pressure to zero within three seconds, permanently disabling the steering wheel
Explanation: Commercial passenger buses have a high center of gravity and carry standing or elderly passengers whose stability is vulnerable to rapid changes in acceleration. Abrupt braking generates high inertial forces that throw passengers forward against partitions or down aisles, which is one of the leading causes of non-collision passenger injuries in public transit.
5Under Ministry of Public Security (MPS) Order No. 162, what is the regulation regarding mobile phone usage by commercial bus drivers while operating a vehicle?
A.Drivers may make handheld phone calls if driving at speeds under 30 km/h in urban bus lanes
B.Drivers are strictly prohibited from answering handheld calls, texting, watching video streams, or browsing devices while operating the vehicle
C.Drivers may send voice messages as long as both hands remain placed at the top of the steering wheel
D.Handheld phone calls are permitted as long as the conversation pertains directly to bus route scheduling
Explanation: Under MPS Order No. 162 and the Road Traffic Safety Law, driving while operating a handheld mobile phone, texting, or watching digital media incurs demerit points and administrative fines. For commercial passenger drivers, zero distraction is strictly enforced because cognitive, manual, and visual distractions drastically increase reaction times and crash risks.
6When assisting elderly passengers, pregnant women, or passengers with limited mobility who are boarding a city bus, what is the driver's proper civilized practice?
A.Close the door immediately after the passenger steps on the first step and accelerate to keep on schedule
B.Wait patiently until the vulnerable passenger is fully seated or securely holding a safety handrail before closing doors and starting smoothly
C.Honk the horn to urge other seated passengers to leave their seats immediately
D.Instruct the mobility-impaired passenger to board through the rear exit door while the bus is moving
Explanation: Civilized passenger transit standards dictate that drivers must exercise patience when vulnerable passengers (elderly, pregnant, children, disabled) board. The driver must ensure the passenger is securely seated or gripping handrails before closing the doors and smoothly starting the vehicle, preventing sudden start-up falls.
7Before pulling away from a bus stop, why must a bus driver thoroughly check the right-side external rearview mirror and blind-spot convex mirrors (下视镜/补盲镜)?
A.To check whether any late passengers, children, or non-motorized vehicles are trapped in the blind spot near the front or rear wheels
B.To inspect whether the vehicle's paint has faded during the stop
C.To ensure that oncoming vehicles in the opposite traffic lane are yielding
D.To verify that the bus advertising panels are facing the curb
Explanation: Large buses have extensive blind spots on their right side, particularly around the front passenger door and right front wheel arch. Checking the wide-angle and blind-spot mirrors ensures that rushing pedestrians, lingering children, or overtaking cyclists are not positioned in dangerous proximity to the wheels before starting.
8Under Ministry of Public Security and Ministry of Transport commercial driving safety regulations, what are the statutory maximum continuous driving time and mandatory rest requirements for long-distance passenger coach drivers?
A.Maximum continuous driving of 4 hours, followed by a mandatory rest of no less than 20 minutes (with long-distance night operations halted or relayed between 02:00 and 05:00)
B.Maximum continuous driving of 8 hours, followed by a mandatory rest of 10 minutes
C.Maximum continuous driving of 6 hours during daytime and 6 hours during nighttime
D.Drivers may drive continuously without rest if they consume caffeinated energy beverages
Explanation: According to MPS Order No. 162 and the Road Transport Regulations, commercial passenger drivers must not drive continuously for more than 4 hours without stopping for at least 20 minutes of rest (at night, continuous driving is limited to 2 hours in some local jurisdictions). Furthermore, long-distance coaches are prohibited from operating on highways between 02:00 and 05:00 unless relay/relay-drop operations (接驳运输) are officially certified.
9Which of the following items must be verified during a commercial bus driver's daily pre-trip safety inspection (出车前检查)?
A.Tire pressure and tread condition, service/parking brakes, steering functionality, fire extinguishers, emergency hammers, and clear emergency exit pathways
B.Only the exterior cleanliness and passenger fare collection box
C.Only the audio system volume and destination digital LED sign
D.The vehicle fuel level only, leaving all mechanical inspections to the annual inspection station
Explanation: Under the Safety Specifications for Power-driven Vehicles Operating on Roads (GB 7258-2017) and transport safety management protocols, commercial bus drivers must conduct a daily pre-trip walkaround check. This includes verifying tire condition, braking and steering systems, lighting, emergency safety hammers, fire extinguisher pressure gauges, and ensuring that emergency doors and aisles are completely unobstructed.
10According to Article 78 of the Regulations for the Implementation of the Road Traffic Safety Law of the PRC, what is the maximum statutory speed limit for large passenger buses (大型客车) operating on expressways under normal weather conditions?
A.100 km/h (whereas small passenger cars may travel up to 120 km/h)
B.120 km/h (identical to small passenger cars)
C.80 km/h on all expressway lanes
D.130 km/h on three-lane expressways
Explanation: Under Article 78 of the Implementation Regulations, the maximum speed limit for large passenger buses (and medium buses) on expressways is capped at 100 km/h, even when the overall road speed limit for small passenger cars is 120 km/h. This speed restriction accounts for the longer braking distances and rollover risks associated with large passenger coaches.

About the China Bus Subject 4 Exam

The China Driver License Subject 4 Theory Test for Large Passenger Vehicles (科目四 安全文明驾驶常识考试 - 客车类) is the statutory final examination administered by the Ministry of Public Security Traffic Management Bureau for commercial bus drivers (A1 Large Bus, A3 City Bus, B1 Medium Bus). Governed by MPS Order No. 162 and the Road Traffic Safety Law of the PRC, it tests passenger safety protocols, civilized driving dynamics, severe weather and complex environment handling, emergency evacuation procedures (bus fire, tire blowout, brake failure, water immersion), and crisis management including disruptive passenger deterrence under PRC Criminal Law Amendment (XI). Officially administered in Chinese, this OpenExamPrep question bank provides an English-language MCQ study adaptation.

Assessment

Computer-based test comprising 50 questions (judgment true/false, single-choice, and multi-choice items). Candidates must score at least 90 points within 45 minutes; accumulating more than 5 wrong answers results in an immediate test termination.

Time Limit

45 minutes

Passing Score

90 out of 100 points (90%)

Exam Fee

Included in the commercial driving school package or ~RMB 30–50 statutory provincial fee (Ministry of Public Security Traffic Management Bureau (公安部交通管理局))

China Bus Subject 4 Exam Content Outline

20%

Passenger Safety & Civilized Driving Dynamics (客车安全与文明驾驶)

Passenger seatbelt reminders (GB 7258-2017), smooth acceleration and progressive braking dynamics, stopping within 30cm of bus bays, zero-distraction rules, door safety (Article 62), pre-trip walkaround inspections, and statutory fatigue rest limits (MPS Order 162)

25%

Complex Weather & Environment Operations (恶劣气象与复杂道路驾驶)

Crosswinds on bridges and valley passes, expressway hydroplaning prevention, dense fog speed and lighting limits (Article 81), mountain descent gear selection and retarder management, tunnel black-hole adaptation and breakdown rules, flood wading depth evaluation, and icy road anti-skid chain protocols

30%

Passenger Emergency Evacuation & Vehicle Failures (客车紧急疏散与车辆故障应急)

Bus fire emergency procedures (pulling over, master power cutoff, manual pneumatic emergency door release, safety hammer corner window strikes, roof escape hatches, dry powder extinguisher operation), front/rear tire blowout recovery, downhill brake failure downshifting and runaway ramps, water immersion escape, and rollover defensive bracing

25%

Passenger Crisis Management & Emergency First Aid (客运危机应对与应急救护)

Deterring steering wheel grabbing and assault under Criminal Law Amendment (XI) Article 133-2 (妨害安全驾驶罪), driver protective partition standards (JT/T 1240), handling cardiac arrest with CPR (30:2 ratio) and AED, arterial bleeding control, open fracture splinting, spinal injury immobilization, and 12122/120 emergency dispatch

How to Pass the China Bus Subject 4 Exam

What You Need to Know

  • Passing score: 90 out of 100 points (90%)
  • Assessment: Computer-based test comprising 50 questions (judgment true/false, single-choice, and multi-choice items). Candidates must score at least 90 points within 45 minutes; accumulating more than 5 wrong answers results in an immediate test termination.
  • Time limit: 45 minutes
  • Exam fee: Included in the commercial driving school package or ~RMB 30–50 statutory provincial fee

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 Bus Subject 4 Study Tips from Top Performers

1Master emergency evacuation mechanics: memorize that tempered glass must be struck at its four corners (not the center) at a 90-degree angle with the pointed safety hammer, and that pneumatic doors can be manually opened by rotating the red emergency valve (应急阀) to release air pressure.
2Understand downhill brake management: remember that friction brakes suffer thermal fade (热衰退) on steep descents; drivers must pre-select a low gear for engine compression braking, utilize auxiliary retarders (缓速器), and strictly avoid neutral coasting (空挡滑行).
3Learn the legal boundaries of Criminal Law Article 133-2: seizing the steering wheel is a criminal offense regardless of whether an accident occurred, and drivers must remain at their posts, decelerate smoothly to a stop, and call 110 rather than engaging in mutual fighting.
4Review first aid metrics: adult CPR chest compression depth is 5–6 cm at a rate of 100–120 compressions/min with a 30:2 compression-to-breath ratio, and tourniquets must be loosened for 1–2 minutes every 40–60 minutes to prevent ischemic limb necrosis.

Frequently Asked Questions

What is Subject 4 (科目四) for passenger buses in China?

Subject 4 (officially the 'Safe and Civilized Driving Knowledge Test' under Subject 3) is the final theoretical examination administered by the Ministry of Public Security Traffic Management Bureau. For large passenger vehicles (A1, A3, B1), it tests passenger safety protocols, emergency egress during bus fires or submersion, complex environment handling, and criminal crisis deterrence.

What is the passing score and format of the official Subject 4 test?

The official exam consists of 50 questions (judgment, single-choice, and multi-choice) on computer, worth 2 points each for a total of 100 points. The pass mark is 90% (90 points). The test duration is 45 minutes, and the computer system automatically terminates the test if a candidate accumulates 6 wrong answers (12 lost points).

What is the legal consequence of a passenger grabbing the steering wheel on a bus?

Under Article 133-2 of the PRC Criminal Law (Amendment XI), seizing steering controls or assaulting a transit driver constitutes the Crime of Endangering Safe Driving (妨害安全驾驶罪), punishable by criminal detention or imprisonment of up to one year and a fine, even if no collision occurred. Drivers who abandon their post to brawl are also subject to criminal prosecution.