What does the white semicircular marking mean?

1 Answers
VonMax
07/29/25 11:32am
White semicircular markings are distance confirmation lines. The radius of the white semicircular distance confirmation line is 30cm, spaced at 50m intervals, and typically set continuously along certain road sections. Additional details are as follows:1. White parallel thick solid lines: Used to provide drivers with a reference for maintaining a safe driving distance, often used in conjunction with distance confirmation signs. These are placed in areas prone to overtaking, accidents, or other necessary sections. The purpose of highway distance confirmation markings is to remind drivers to maintain a safe distance from the vehicle ahead to prevent traffic accidents.2. White zigzag distance confirmation lines: These lines have a total width of 300cm, with line widths of 40cm or 45cm. Starting from the base point at 0m, they are placed every 5 meters, with two lines forming a group, spaced 50m apart, and repeated in five groups. Multiple groups may also be set based on site conditions.3. White rectangular distance confirmation lines: Used in conjunction with distance confirmation signs, these are placed in areas prone to overtaking, accidents, or other necessary sections. The purpose of highway distance confirmation markings is to remind drivers to maintain a safe distance from the vehicle ahead to prevent traffic accidents.
Was this review help?
16
4
Share
More Forum Discussions

What are the reasons for the Wuling air conditioner not cooling?

The common reasons for the Wuling air conditioner not cooling are likely due to slight refrigerant leakage or excessive refrigerant. Here are the solutions for car air conditioner refrigerant not cooling: 1. Slight refrigerant leakage: This can be observed from the sight glass on top of the dryer tank. During normal operation of the air conditioner, if there are continuous slow bubbles in the sight glass, it indicates insufficient refrigerant. If obvious bubble flipping occurs, it means the refrigerant is severely insufficient. The solution for insufficient or too little refrigerant is to add refrigerant. However, please note: if adding from the low-pressure side, do not invert the refrigerant bottle; if adding from the high-pressure side, do not start the engine. 2. Excessive refrigerant: This can be observed from the sight glass on top of the dryer tank. If no bubbles are visible in the sight glass during operation of the car air conditioner, and no bubbles appear after the compressor stops, it definitely indicates excessive refrigerant. If the amount of pressurized cooling oil is too much, relatively turbid bubbles can be seen in the sight glass during normal operation of the air conditioning system. Of course, if it is indeed excessive refrigerant, you can slowly release some from the maintenance port on the low-pressure side of the air conditioning system.
15
0
Share

Why don't original manufacturers use aluminum foil soundproof cotton?

Original manufacturers don't use aluminum foil soundproof cotton to save costs. Here is some knowledge about aluminum foil soundproof cotton: 1. Function: The main function of aluminum foil soundproof cotton is to use aluminum foil to isolate and reflect engine heat, preventing heat conduction to the hood and affecting the hood paint. 2. Introduction: Aluminum foil soundproof cotton has enhanced waterproof performance, and its thermal insulation performance is excellent due to its low thermal conductivity, providing good heat insulation. Excellent thermal insulation is a basic characteristic of rock wool and its products. Under normal temperature conditions (around 25°C), the thermal conductivity of rock wool is usually between 0.03 and 0.047 W/(m·K). The surface materials and insulation materials are non-combustible, fully meeting fire protection requirements. The combustion performance depends on the amount of combustible binder. Rock wool itself is an inorganic mineral fiber and is non-combustible.
12
3
Share

How to Connect CarPlay in Volkswagen?

Simply connect your phone using a data cable. Here is some information about CarPlay: 1. CarPlay: It is an in-car system released by Apple Inc. in the U.S., seamlessly integrating users' iOS devices and iOS experience with the dashboard system. 2. Function of CarPlay: It allows the use of most basic functions of an iPhone through the car's control panel. Some of these functions include Siri voice assistant, iTunes music playback, Apple Maps, and messaging services.
8
5
Share

Why Won't My Hyundai Start?

In most cases, the reason a Hyundai vehicle won't start is due to a dead battery that cannot generate sufficient voltage. Other possible reasons include: 1. Carburetor issues: Usually caused by prolonged usage over time. 2. Spark plug problems: Sometimes fuel may flood the spark plugs. Check if the spark plug heads are oily or wet, as this can also prevent the engine from starting. 3. Weather conditions: For example, cold winter weather can make it difficult to start the engine. 4. Battery problems: If the engine fails to start, it may drain the battery, potentially damaging it. 5. Idle speed issues: Sometimes starting problems may be caused by low idle speed. In summer, the tachometer needle should point to one mark or slightly more, while in winter it should be adjusted to one and a half marks or below two marks.
16
0
Share

Why can't the differential lock be turned off?

The F1 display on the refrigerator indicates a fault with the freezer evaporator sensor (short circuit or open circuit). The solution to the F1 display is to start the refrigerator after the car is ignited, use an adapter for power supply, and adjust the battery protection to medium or low level. Additional details are as follows: 1. Operating environment temperature of the refrigerator: The higher the ambient temperature, the shorter the battery usage time; 2. Types and quantity of items stored in the refrigerator: The more items, the more power the refrigerator consumes to maintain the set temperature; 3. Frequency of door openings: Frequent opening and closing increases power consumption; 4. Capacity and charge state of the car battery: The larger the battery capacity, the longer the usage time; the more sufficient the charge, the longer the usage time; 5. Set temperature of the refrigerator: The lower the set temperature, the higher the power consumption; 6. Battery protection level setting of the refrigerator: The higher the battery protection level, the shorter the usage time.
5
1
Share

How to Remove Cement Stains from the Car Body?

Methods to remove cement stains from the car body: 1. If the stain has been there for less than 12 hours, first wet and soak it with water, then slowly wash it with car wash soap and a towel. Although this method is slower, the effect is quite good; 2. If the stain has been there for more than 12 hours, the cement will have hardened by then. You can purchase some acidic solution from a pharmacy, dip a brush in it, and apply it to the cement. The cement will dissolve in the acidic liquid, and then you can rinse it off with water; 3. Pour gasoline onto the stain, wait for it to soften slightly, and then wipe it off. This method is suitable for large-area removal; 4. Spray white vinegar onto the cement with a spray bottle, wait for 3 to 5 minutes, and then wash the area with car wash soap. This method ensures no residue is left behind.
6
1
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.