Why can't I schedule Subject 3 on 12123?

2 Answers
LeEmiliano
07/25/25 7:31am
The reasons for being unable to schedule Subject 3 on the Traffic Management 12123 platform are as follows: 1. Ranking exceeds available slots: If your scheduling rank exceeds the test center's capacity, the chance of successful scheduling is extremely low unless some candidates cancel their appointments. 2. Multiple cancellations: Note that there are limits on cancellation times for each subject. Frequent cancellations may negatively impact your next scheduling attempt. 3. Incomplete training hours: Scheduling will fail if required Subject 3 training hours aren't completed. Typically, Subject 3 requires 16 hours of theoretical training and 24 hours of practical training, with slight regional variations - please refer to local standards. 4. Exam cheating: Candidates who had scores canceled due to cheating must wait one year before rescheduling, during which any scheduling attempts will fail.
Was this review help?
4
0
Share
JackFitz
08/10/25 6:34pm
I also experienced the frustration of not being able to book Subject 3 on the 12123 app, mainly because the app gets too crowded during peak hours, and the system lags when too many people log in. I remember when I was taking my driver's license test, my coach reminded me to avoid the peak hours around 7-8 PM and instead try refreshing the page early in the morning or on weekday mornings for a higher success rate. Limited slots are also a key issue—each test center releases only a small number of slots per week, so if you're slow, you'll miss out. Additionally, checking personal information is crucial. If your ID number or photo is incorrect, the system will automatically reject your application, and you'll need to verify the details at the driving school. Driving safety is a big deal, so don’t get too anxious if you can’t book a slot right away. Use the time to practice road rules more, which will be very helpful for preventing accidents when you eventually hit the road. In short, keep trying, don’t give up, and remember that mastering the skills safely is the ultimate goal.
Was this review help?
5
3
Share
Expand All
More Forum Discussions

What is the engine speed at 80 mph?

The engine speed at 80 mph is between 1500 and 3000 RPM. Below is a comparison of vehicle speed and gear RPM, as well as an introduction to gear and RPM under different conditions: Comparison of vehicle speed and gear RPM: Starting in first gear, the engine speed is around 1000-1500 RPM; in second gear, the engine speed is around 1500-2000 RPM; in third gear, the engine speed is around 1500-2000 RPM; in fourth gear, the engine speed is around 1500-2000 RPM; in fifth gear, the engine speed is around 1500-3000 RPM. Gear and RPM under different conditions: When driving a manual transmission car, the gear should match the engine speed and driving speed. During high-speed cruising, the highest gear should be used to reduce the engine speed, which helps improve fuel economy. When overtaking, it is necessary to downshift in advance to increase the engine speed and wheel torque, which helps the driver overtake quickly.
9
5
Share

Reasons for Severe Vibration When Braking in D Gear

The reasons for vibration when braking in D gear are as follows: 1. After severe clutch wear, 'sliding friction' may occur when stopping in D gear; because wear reduces the friction between the two, and sliding friction can cause abnormal vibrations, rapidly increasing the clutch temperature. Therefore, stopping in D gear at relatively low temperatures may result in regular resonance or abnormal noises. 2. All torque converters can also wear out, and severe wear cannot rule out the possibility of abnormal slipping; coupled with wear or looseness of the power output shaft, or issues with the transmission gear bearings, irregular resonance when stopping in D gear is highly likely. 3. Carbon deposits can cause engine idle vibration. When in D gear, the engine needs to output power, and the RPM will be slightly higher than idle speed; however, if the throttle, intake and exhaust valves, spark plugs, or fuel injectors have severe carbon buildup, the air-fuel mixture and combustion efficiency at low RPMs will deteriorate.
7
2
Share

What does 'several liters of fuel consumption' mean?

It refers to the average fuel consumption of a vehicle per 100 kilometers traveled, measured in liters per 100 kilometers (L/100km). Below is an introduction to two fuel consumption evaluation metrics: 1. Constant-speed fuel consumption: This is a fuel economy indicator when a vehicle travels at a constant speed on a good road surface. Since constant-speed driving is a fundamental operating condition for vehicles on highways, and this type of fuel consumption is easy to measure, it is widely adopted. 2. Road cycle fuel consumption: This is a fuel economy indicator measured when a vehicle follows specified speed and time protocols for repeated cyclic driving on roads, also known as multi-condition road cycle fuel consumption. The speed and time protocols specify various driving conditions for each cycle, including gear shift timings, braking and stopping times, as well as driving speeds, acceleration, and braking deceleration values. Therefore, the fuel economy measured this way is closer to the actual driving conditions of the vehicle.
16
2
Share

How to Pass the Exhaust Emission Test During Annual Inspection?

Exhaust emission testing is a mandatory item during the annual inspection of vehicles. To pass the exhaust emission test during the annual inspection, regular maintenance of the three-way catalytic converter is essential. Use cleaning solvents, drip cleaning, or non-disassembly cleaning methods for the three-way catalytic converter. Some 4S shops offer this service. Before the test, try to use up the fuel in the tank and then refill with higher-grade fuel from a reputable gas station, as this can help with the emission test. If the vehicle has been used for a long time and shows signs of corrosion in the exhaust pipe, it is advisable to have it inspected and repaired promptly. If necessary, replace the exhaust pipe to improve the chances of passing the emission test. Severely corroded exhaust pipes usually make it difficult to pass the test. Nowadays, when purchasing vehicle insurance, insurance companies often provide inspection cards that assist with the annual inspection and exhaust emission testing, saving a lot of hassle. Dedicated channels can also help ensure a smooth emission test. Be sure to check with the insurance company if they assist with the emission test. Many vehicle owners lack confidence in their vehicle's condition and may attempt to pay someone to 'help' pass the emission test.
5
2
Share

Why can't the rear seat buckle stay fastened?

Rear seat buckles may not stay fastened due to damage or misalignment. Below is a classification of car seats: 1. By shape: Split seats, bench seats. 2. By function: Fixed, removable, adjustable. 3. By passenger capacity: Single, double, multi-seat. 4. By performance features: Air-cushion seats, power seats, stereo seats, fatigue-recovery seats, electronically adjustable seats. Here is extended information about the function of child safety seats: 1. Seatbelt: Child safety seats function similarly to seatbelts. 2. Protection: The raised sides of child safety seats provide better wrapping and improved protection for a child's head and sides. 3. Injury reduction: During collisions or sudden deceleration, they reduce impact forces and limit body movement, thereby minimizing injuries.
7
3
Share

Why is the car's airbag light constantly on?

The following are situations where the airbag light may illuminate: 1. Instrument self-test When entering the car and starting the ignition, the instrument panel will perform an automatic self-check. After the self-check is completed, the airbag light will automatically turn off. This process usually takes about 5 seconds and is a normal phenomenon. If the airbag light remains on for a long time after the self-check, it can be determined that there is a genuine fault. 2. False fault If the car battery is low on power, it may also cause the airbag light to illuminate. Additionally, the airbag system may feedback a signal indicating low pressure in a certain airbag, generating a fault code. In this case, simply clearing the fault code will resolve the issue. 3. Genuine fault If the above two reasons are excluded, then it may be a wiring fault that requires timely repair. The cause of this fault could be related to the airbag itself, collision sensors, airbag clock spring, or other wiring-related issues.
2
4
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.