What are the causes of traffic congestion on highways?

Why are the steering wheels on the right side of cars in Hong Kong?

The steering wheels in Hong Kong are on the right side because, before its return to China, Hong Kong was influenced by the UK, where traffic rules dictate driving on the left side. Even after the handover, Hong Kong has continued to follow the left-hand driving system. Due to historical reasons, Hong Kong follows left-hand traffic rules, while mainland China follows right-hand traffic rules. Therefore, after Hong Kong's return in 1997, the 'one country, two systems' approach was also applied to road traffic regulations. When mainland vehicles enter Hong Kong, they must follow Hong Kong's left-hand driving rules. Conversely, Hong Kong vehicles entering the mainland must also adapt to local customs. This arrangement has led to many inconveniences. Although clear boundary signs are erected at the border between Hong Kong and the mainland, the busy traffic makes it difficult for incoming vehicles to switch driving sides immediately upon crossing the border. To address this issue, a special bridge was constructed at the Shenzhen-Hong Kong border. Incoming vehicles only need to follow their original driving rules, and through the bridge's clever design, right-hand drive vehicles naturally switch to left-hand drive in Hong Kong, and vice versa.

8

1

Share

Why does the Audi A4 air conditioning suddenly stop cooling?

Here are the reasons and solutions for the Audi A4 air conditioning not cooling: 1. Too much or too little refrigerant can cause the car air conditioning to stop cooling. Excessive refrigerant is usually caused by overfilling during maintenance, as the proportion of refrigerant in the air conditioning system must meet certain requirements. If the proportion is too high, it can affect heat dissipation, meaning more heat dissipation results in greater cooling capacity; conversely, less heat dissipation results in lower cooling capacity. If there is insufficient refrigerant in the air conditioning system, the amount of refrigerant sprayed into the evaporator from the expansion valve will also decrease, and the heat absorbed during evaporation in the evaporator will consequently decrease, leading to reduced cooling capacity. Solution: If there is too much refrigerant in the car air conditioning, some can be slowly released from the maintenance port on the low-pressure side of the system. If there is insufficient refrigerant, it should be added. However, when adding refrigerant, note that if adding from the low-pressure side, the refrigerant bottle must not be placed upside down, and if adding from the high-pressure side, the engine must not be started. 2. Loose compressor drive belt. If the car air conditioning compressor drive belt is loose, the compressor may slip during operation, reducing transmission efficiency and thus decreasing the cooling effect. Solution: Check if the drive belt is broken or loose, if there is noise inside the compressor, and if the compressor clutch is slipping.

14

2

Share

Where is the standard position for a shark fin antenna?

The shark fin antenna is installed on the roof of the car, above the rear windshield. Utilizing electronic properties, the shark fin antenna directs static electricity to its tip for release. Regardless of its installation position on the car, it effectively reduces static electricity. The specific functions of the shark fin antenna are as follows: After installing a shark fin antenna, airflow is split by the fin before forming tail vortices, thereby reducing driving resistance. Particularly at speeds above 100km/h, the "shark fin" antenna significantly aids in lowering fuel consumption. Wind tunnel experiments have shown that the "shark fin" antenna can reduce high-speed fuel consumption by 3%, a remarkably encouraging figure. Essentially, the shark fin serves as a car antenna, intercepting high-frequency radio waves from transmission towers and delivering them to the car's radio, mobile phone, or navigation receiver for demodulation. Given cars' high sealing requirements, internal communication signals can weaken. To enhance signal strength, antennas are designed into vehicles. The "shark fin" antenna's primary advantage over traditional antennas is its superior signal enhancement. Its built-in signal receiver offers strong anti-interference capabilities and minimal radio wave disruption, ensuring both improved signal strength and stability. Additionally, it eliminates the aerodynamic noise associated with rod antennas, providing a quieter ride. Moreover, during dry seasons, vehicles are prone to static electricity, which can damage onboard circuits. The "shark fin" antenna effectively addresses this issue by acting as a static discharger, safely releasing accumulated static to protect both vehicle electronics and passenger safety.

13

4

Share

How Long Before a Driver's License Expires Without Taking the Test?

Driver's license does not expire within three years. Details are as follows: 1. After passing: After completing the subject one test, the subject two and subject three tests should be passed within three years. 2. If not passed: If you cannot pass, the content of the test will be invalidated, and you should re-register for the subject one test. 3. Others: After the new regulations, both subject two and subject three have five attempts. If you cannot pass the test within five attempts, you will need to retake the subject one test. Additional information: The order of the test subjects is carried out in sequence as traffic regulations and related knowledge, field driving, and road driving.

13

1

Share

What are the hazards of butyl rubber vibration damping sheets?

The hazard of butyl rubber vibration damping sheets is the issue of odor. Here is extended information: 1. Butyl rubber vibration damping sheets consist of a high-density butyl rubber board with an additional layer of aluminum foil, typically used on car bodies to provide noise insulation and reduction, as well as to enhance structural strength. 2. Butyl rubber vibration damping pads are high-density damping rubber boards with an aluminum foil surface. 3. The main functions of vibration damping sheets are: suppressing steel plate resonance, efficiently blocking noise with high density, enhancing steel plate toughness, and improving safety. 4. Automotive noise insulation involves detailed treatment of engine noise, resonance from tire and road vibrations, and friction sounds caused by gaps or aging components in the cabin, based on the vehicle's performance, road conditions, and usage conditions, to improve ride comfort.

4

1

Share

What are the differences between BMW X1 and the new X3?

The differences between BMW X1 and X3 are as follows: 1. The BMW X1 is positioned as a compact SUV, while the BMW X3 is positioned as a midsize SUV. 2. The BMW X3 has a larger body size, and its interior is more luxurious with richer configurations. The BMW X3 comes standard with an 8-speed automatic transmission, ensuring high reliability, and features a standard all-wheel-drive system, equipped with three variants of the 2.0T engine with high and low power tuning. The BMW X1 has been localized for production and offers a 1.5T three-cylinder plug-in hybrid model, with all models featuring an automatic transmission (available in either 6-speed or 8-speed automatic).

1

5

Share

What are the causes of traffic congestion on highways?

Why are the steering wheels on the right side of cars in Hong Kong?

Why does the Audi A4 air conditioning suddenly stop cooling?

Where is the standard position for a shark fin antenna?

How Long Before a Driver's License Expires Without Taking the Test?

What are the hazards of butyl rubber vibration damping sheets?

What are the differences between BMW X1 and the new X3?

Should the handbrake be engaged when the P gear is already on?

What documents are required to replace a vehicle registration certificate?

What Are the Parking Assistance Functions?

Which gear should be used when driving uphill with a CVT transmission?