How long does a car driver's license remain valid without being taken?

Should You Shift to Neutral or Keep Your Foot on the Brake at a Red Light?

When waiting at a red light, if the duration is relatively long, the better practice is to shift the car's gear to Neutral (N) and then engage the handbrake. Although this method is slightly more cumbersome, it significantly improves safety compared to keeping the car in a low gear. If the red light is about to turn green in just a few seconds, you can simply keep your foot on the brake while remaining in Drive (D) gear. Below is an introduction to automatic transmissions and braking: Impact of Prolonged Braking: Prolonged braking generates heat due to friction between the brake pads and brake discs. If this heat accumulates and is not dissipated in time, excessive heat can lead to a reduction in braking efficiency, affecting driving safety. Therefore, it's important to be mindful of braking duration and to regularly inspect and replace brake components. Introduction to Automatic Transmissions: An automatic transmission, as the name suggests, eliminates the need for the driver to manually shift gears. The vehicle automatically selects the appropriate gear based on driving speed and traffic conditions. Typically, an automatic transmission car has six gear positions, arranged from top to bottom as: P (Park), R (Reverse), N (Neutral), D (Drive), S (Sport), and L (Low). For general driving needs, using just P (Park), R (Reverse), N (Neutral), and D (Drive) gears is sufficient. However, specific driving conditions may require the use of other functional gears.

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Can I use 92 octane unleaded gasoline if the requirement is '92 octane or above'?

The '92 octane or above unleaded gasoline' requirement on the fuel tank cap includes 92 octane, and the vehicle user manual also provides detailed instructions in this regard, stating that at least 92 octane or higher gasoline should be used. Therefore, using 92 octane gasoline is acceptable. Unleaded gasoline contains only trace amounts of lead derived from crude oil, generally about 0.01 grams per liter. Its octane rating is 95, slightly lower than other grades of leaded gasoline currently available. Using unleaded gasoline can effectively control harmful substances in vehicle exhaust, reducing pollutants such as hydrocarbons, carbon monoxide, and nitrogen oxides. The most effective and simplest way to reduce emissions is to install a catalytic converter in the exhaust system. However, if the lead content in gasoline exceeds 0.013 grams per liter, the catalyst will become ineffective, failing to control vehicle exhaust emissions. Gasoline is categorized into leaded gasoline (phased out of the market), unleaded gasoline, and ethanol gasoline. Due to the implementation of new environmental standards, many vehicles now recommend the use of more environmentally friendly unleaded gasoline and ethanol gasoline. Ethanol gasoline is blended with 90% regular gasoline and 10% fuel ethanol, uniformly labeled as E92, E95, and E98, where 'E' stands for ethanol.

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What Causes Unstable Idle Speed When Starting the Engine?

Reasons for unstable idle speed when starting the engine: Intake manifold leakage: When unauthorized air, gasoline vapor, or exhaust gases enter the intake manifold, causing the air-fuel mixture to become too rich or too lean, it leads to unstable idle speed in the vehicle. Excessive carbon buildup in the throttle body: Too much carbon deposit in the throttle body and surrounding intake passages changes the cross-sectional area of the air passage, making it impossible for the control unit to precisely regulate the idle air intake. This also results in an overly rich or lean mixture, causing unstable idle speed. Faulty intake system actuators: The engine's intake system has numerous actuators, such as the throttle motor, idle speed control motor, duty cycle solenoid valve, mass air flow sensor, and intake pressure sensor. Malfunction or damage to these components can cause unstable idle speed in the vehicle.

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What is the damage of sudden braking to a CVT transmission?

Sudden braking damage to CVT transmission: It will significantly reduce the service life of the transmission. Reduced service life: Mainly affects the service life of tires, increasing wear; reduces the service life of the engine; decreases the service life of the clutch system. Increased fuel consumption: Reduces the service life of brake pads and brake discs; accelerates the aging of brake calipers and master cylinders. Brake pads: They are the most critical safety components in a car, among the most frequently used parts in the vehicle's braking system and daily driving. Regular maintenance is essential. When driving, avoid frequent sudden braking as it causes significant damage to the car.

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Are there any speed requirements for night driving?

Passenger vehicles must not exceed 80% of the daytime speed limit when driving at night. Regulations for motor vehicles driving on roads: Do not exceed the speed indicated by speed limit signs or markings; On roads with two or more motor vehicle lanes in the same direction and without speed limit signs or markings, the maximum speed on urban roads is 70 km/h. The maximum speed on closed motor vehicle-only roads and highways is 80 km/h. Precautions for driving speed on urban roads: Speeding within 10% of the prescribed speed limit will not result in a fine but will incur 3 demerit points. Speeding between 10% and 20% of the prescribed speed limit will result in a fine and 3 demerit points. Speeding over 70% of the prescribed speed limit will result in a fine, 6 demerit points, and may also lead to the revocation of the driver's license.

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What does the engine symbol appearing on a car mean?

The engine symbol appearing on a car is the engine fault light. The reasons for the engine fault light to illuminate are as follows: Exhaust emissions not meeting standards: Poor fuel quality, failure of the three-way catalytic converter, excessive carbon buildup in the intake pipe, clogged fuel injectors, failure of the oxygen sensor, occasional engine misfires, etc., can all cause the engine fault light to illuminate. Among these, poor fuel quality is the most common cause. Poor engine performance: The fault light may illuminate due to poor performance of the engine system. Issues such as throttle pedal sensor failure, throttle position sensor failure, air flow meter failure, crankshaft position sensor failure, or poor line contact can all cause the engine fault light to illuminate.

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How long does a car driver's license remain valid without being taken?

Should You Shift to Neutral or Keep Your Foot on the Brake at a Red Light?

Can I use 92 octane unleaded gasoline if the requirement is '92 octane or above'?

What Causes Unstable Idle Speed When Starting the Engine?

What is the damage of sudden braking to a CVT transmission?

Are there any speed requirements for night driving?

What does the engine symbol appearing on a car mean?

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What is the fuel tank capacity of the Changan CS55 in liters?

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