What does 84H on a tire mean?

Are There Street Lights on Highways?

There are no street lights on highways. Installing street lights on highways is costly and affects driving safety. Highways have a comprehensive reflective system to ensure driving safety. Below is a detailed explanation of why highways do not have street lights: Cost Reasons: China has a vast territory with significant spans from east to west and north to south. According to urban road standards, the maximum interval between two street lights is 50 meters. Installing street lights across the entire highway network would result in astronomical installation and maintenance costs. Safety Concerns: Street light illumination is discontinuous and uneven. For drivers of high-speed vehicles, this alternating light and dark can cause visual errors (illusions), which are very dangerous. Reflective System as a Solution: Highways are equipped with a comprehensive reflective marking system, including hot-melt reflective markings (such as lane lines), film-type reflective delineators (for barriers and guardrails), and illuminated ground lights. These can reflect road indicators, traffic signs, roadside outlines, lane dividers, and central median outlines.

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What Causes Water Accumulation Under the Rear Floor Mats of a Sylphy?

Water under the floor mats of a Sylphy can be caused by leaks from the floor drain plugs, sunroof drainage pipes, door leaks, coolant leakage from the heater core, or damage/misinstallation of the air conditioning drainage pipe. It is recommended to have the vehicle inspected and repaired at a 4S shop. To address water accumulation under the car mats, first remove the soaked mats and then clean out the remaining water inside the vehicle. There are several rubber sealing plugs at the bottom of the vehicle chassis; opening these plugs can help drain the accumulated water inside the cabin. Note: If the leak in the Sylphy's main driver compartment is coming from the outside, while the passenger compartment is mostly affected by air conditioning leaks during this season, it is advisable to have the car checked at a repair shop. If the issue is due to non-waterproof floor mats, it is recommended to use mats with waterproof properties. Non-waterproof mats are prone to mold and odor, affecting their lifespan. Also, check the door drainage channels by opening the door and inspecting the small holes at the bottom, which are drainage outlets, to see if they are clogged.

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Is it necessary to change the rear differential oil?

Rear differential oil needs to be replaced, with a typical replacement interval of 80,000-100,000 kilometers. Changing the differential oil prevents excessive wear of the vehicle's differential gears, which could lead to differential damage. Differential oil serves as the lubricant for the rear axle gear transmission mechanism, also known as gear oil. Its main functions are lubrication and cooling. Due to differences in the axial positions and tooth profiles of gears, there are significant variations in contact stress and relative sliding speed at the meshing surfaces. Therefore, different types of gear oil are required. Failure to replace differential oil increases friction between gears in the differential structure, raises vehicle fuel consumption, and over time can damage components like the differential and differential lock. The functions of differential oil include forming an oil film on gear meshing surfaces to provide lubrication, reducing friction resistance and extending component lifespan; and dissipating heat generated by friction pairs through fluid circulation for cooling purposes. Its working principle involves maintaining differential operation during high-speed driving when lubricant temperatures in the differential become extremely high, far exceeding engine oil temperatures, ensuring normal vehicle operation.

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What to Do When the Car Door Makes Noise When Opening?

Door noise is mainly caused by lack of lubrication, but it is necessary to determine whether it is from the door hinge position or internal components such as the window regulator, door lock mechanism, or handle mechanism. You can go to a repair shop and ask the mechanic to clean it, then apply a little oil, and also clean the door stopper and apply some oil, which should improve the situation. Here are some related details: 1. The door and the car body are connected by hinges, similar to a house door, and it is normal for hinges to make noise after prolonged use. To ensure the pulley remains smooth and quiet for a long time, lubricating oil can be applied regularly every 2-3 months for maintenance. 2. If the car has been used for a while, check whether the door seal is aging, as the seal is made of rubber. Over time, the seal will gradually age and deteriorate, which can cause noticeable wind noise and friction sounds for the driver and passengers. If the seal is aged or damaged, it is recommended to replace it directly. Regularly clean the dust and rainwater between the seal gaps during daily use to prevent aging.

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What to Pay Attention to When Entering or Exiting Highway Ramps

When entering or exiting highway ramps, it is important to turn on the turn signal in advance, observe oncoming traffic when entering the ramp, control your speed, and most importantly, avoid overtaking. Below are specific precautions: When driving on highways or entering/exiting ramps, make sure to turn on the turn signal ahead of time. When entering the highway from a ramp, you should activate the left turn signal in advance to alert vehicles behind you to yield. Be sure to check for oncoming traffic on the main road before merging into or exiting the highway ramp, and only proceed when it is safe to do so. When driving on a ramp, maintain a controlled speed and avoid speeding, as ramps are often narrow and curved, making it easy to be caught by speed cameras. Always drive at a reduced speed. Do not overtake on ramps. Some ramps have a single lane, while others have multiple lanes with dashed lines for a certain distance. However, even if the lines are dashed, avoid overtaking on ramps because they are typically curved, sometimes sharply. High-speed overtaking can generate strong centrifugal force, increasing the risk of rollovers or side-swipe accidents.

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How to Use the Clutch When Driving Uphill?

Correct operation instructions for starting uphill with the clutch: 1. First, when driving halfway up the slope, slowly press both the brake and clutch simultaneously to stop the car on the slope; 2. Then engage the handbrake and shift to neutral, at this time release the brake and clutch, and the vehicle will come to a complete stop; 3. When starting uphill, first press the brake and clutch; 4. Then shift into first gear, while placing your right hand on the handbrake and left hand on the steering wheel; 5. Slowly release the clutch, and you can also slowly release the brake at the same time, observing the changes in the vehicle's condition; 6. When the clutch is released to the point where the vehicle starts to shake, keep your foot on the clutch still and simultaneously release the handbrake with your right hand; 7. If there is no obvious rollback of the vehicle at this time, move your foot from the brake to the accelerator, gently press the accelerator, and slowly release the clutch to start the vehicle.

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What does 84H on a tire mean?

Are There Street Lights on Highways?

What Causes Water Accumulation Under the Rear Floor Mats of a Sylphy?

Is it necessary to change the rear differential oil?

What to Do When the Car Door Makes Noise When Opening?

What to Pay Attention to When Entering or Exiting Highway Ramps

How to Use the Clutch When Driving Uphill?

Can You Drive When the Oil Warning Light Comes On and Then Returns to Normal?

What Vehicles Are Suitable for Shell Helix HX5/HX6 Engine Oil?

Under what circumstances can you park on the highway emergency lane?

What types of vehicles can a C1E driver's license drive?