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Can the Front of the Car Go Out of Line in an S-Turn?

1 Answers
DiMalachi
07/30/25 9:34am
In the S-turn segment of the Subject 2 driving test, the front bumper of the car can go out of line as long as the wheels do not cross the line. Here is additional information: The curve driving (S-turn) is an assessment point in Subject 2 of the driver's test. The requirement is for the vehicle to drive on an S-shaped road of specified width without squeezing the edge lines, with smooth steering. The purpose is to train drivers in the use of steering and the mastery of wheel trajectory. Evaluation criteria: If the vehicle drives out of the edge line, it is a failure; if the wheels run over the edge line, it is a failure; if the engine stalls or the vehicle stops midway, it is a failure.
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More Forum Discussions

Can You Still Drive with a Nail in Your Car Tire?

If a car tire is punctured by a nail, it can still be used if it is a run-flat tire, but you should avoid driving too fast or too far. However, if the tire is a standard tire, it should not be used anymore. Car tires are one of the most important components of a vehicle, as they directly contact the road surface and work with the suspension system to absorb shocks during driving, ensuring a comfortable and smooth ride. Precautions after a tire puncture: 1. Whether the car uses standard tires or run-flat tires, they should be repaired or replaced as soon as possible to avoid safety hazards. 2. When replacing a spare tire, park the vehicle on a stable surface without obstructing other traffic, and place a triangular warning sign about 100 meters behind the car. 3. Whenever possible, replace the tire with an original equipment manufacturer (OEM) tire.
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What Does the P in a Car Stand For?

In a car, the P stands for Park, which is the most common gear in automatic transmission models. It is usually located at the foremost position on the gearshift console, in front of the R (Reverse) gear. It is primarily used when the driver parks the car and does not intend to move it. When the gear is in P, the wheels are mechanically locked, preventing the car from rolling. Its main purposes are: 1. Parking on flat ground: Since the P gear is both a neutral gear and equipped with a braking mechanism, engaging P directly facilitates parking. 2. Parking on slopes: The core function of the P gear is to enable safe and long-term parking on slopes for automatic transmission cars, which is a key role of the P gear in the entire automatic transmission vehicle industry. 3. Forced braking: In automatic transmission cars, the car key can only be removed when the gear is shifted to P, effectively forcing the driver to ensure the car is securely parked before leaving with the key. 4. Neutral starting: In automatic transmission models, the engine can only be started when the gear is in P or N (Neutral), preventing sudden jerks that could lead to accidents.
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What is the normal engine speed for a sedan?

Normal sedan engine speed is around 2200 to 2500 RPM. Regardless of the gear, maintaining the engine speed at approximately 2200 to 2500 RPM is the most fuel-efficient. The engine speed is related to the number of work cycles per unit time or the effective power output of the engine, meaning the effective power varies with different speeds. Therefore, when specifying the effective power of an engine, the corresponding speed must also be indicated. The effective power and its corresponding speed specified on the engine nameplate are referred to as the rated power and rated speed, respectively. The operating condition of the engine at rated power and rated speed is called the rated condition. Rated power is not the maximum power the engine can produce; it is the maximum usable limit of effective power determined based on the engine's intended use. For the same engine model, the rated power value may differ depending on its application, and the effective torque also varies with the engine's operating conditions.
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How to Identify the Front and Back of a Car's Cabin Air Filter?

The side of the car's cabin air filter with the arrow pointing upwards is the front side, while the side with the arrow pointing downwards is the back side. You can also determine the front and back by observing the surface of the air filter: the ordinary fuzzy side is the front, and the side with the support line structure is the back. The cabin air filter is installed in the car's air conditioning system to absorb dust particles, alleviate respiratory discomfort, reduce irritation for allergy sufferers, and protect the air conditioning cooling system. Maintenance methods for the cabin air filter: 1. If the airflow from the air conditioner significantly decreases, the cabin air filter may be clogged. First, clean the filter or replace it if necessary; 2. The frequency of cleaning depends on road conditions, and it is recommended to clean it earlier rather than later; 3. The cabin air filter should be correctly installed in its position. Using the air conditioner when the filter is removed may degrade its dust-proof performance and affect the air conditioner's performance; 4. In cities with poor air quality, it is recommended that car owners replace the cabin air filter twice a year.
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Should an automatic transmission be started in P gear or N gear?

An automatic transmission should be started in P gear. From the perspective of the transmission's working principle, when starting the engine in P gear and then shifting through R gear without stopping, there will be no additional damage to the transmission. Some automatic vehicles can only be started in P gear, and if the road surface is uneven, starting in P gear can also prevent the vehicle from rolling. Differences between P gear and N gear: 1. Different names: P gear is called the parking gear, also known as the parking lock; N gear is called the neutral gear. 2. Different functions: P gear is used when the vehicle is parked or not in use for a period of time; N gear is only used for short-term parking. 3. Different working principles: When P gear is engaged, the parking pawl inside the transmission is partially locked, and the wheels are mechanically locked; engaging N gear is equivalent to shifting into neutral, where the engine and the drive shaft are completely separated at the transmission position, with no power transmitted to the output shaft, but it does not have a braking function.
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How to Replace the Remote Battery for a Mercedes-Benz Car?

The method for replacing the remote battery of a Mercedes-Benz car: 1. From the tail of the key, push up the marked switch, and the hidden mechanical key will pop out slightly, then you can take out the mechanical key; 2. Still at the tail of the key, use the just removed mechanical key to press against the marked position, apply a slight force, and the key shell can be opened; 3. After removing the key shell, you can see the battery position is relatively deep, use any object to slide into the gaps on both sides and gently pry to remove the old battery; 4. After installing the new battery, ensure the positive and negative poles are not reversed, then proceed with the installation steps—insert the top of the shell first, then press firmly on the other end to complete the battery replacement, finally reinsert the mechanical key.
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