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What is the difference between National 5 and National 6 vehicles?

1 Answers

CollinDella

07/29/25 9:45pm

The biggest difference between National 5 and National 6 vehicles lies in their exhaust emissions. The National 5 standard sets the carbon monoxide limit at 1000mg/km, while the National 6a standard reduces it to 700mg/km, and the National 6b standard cuts it in half to just 500mg/km. Limits for other pollutants such as nitrogen oxides and particulate matter have also been significantly reduced. Specific details are as follows: 1. The difference in catalytic converters: The National 6 emission standard reduces particulate matter by 67% and nitrogen oxides by 77% compared to National 5, which can be simply understood as "the difference of one catalytic converter." 2. National 6a and National 6b: The National 6 standard is known as the strictest emission standard to date, implemented in phases with two emission limit schemes—National 6a and National 6b—rolled out in 2020 and 2023, respectively. Additionally, key regions with special requirements for atmospheric environmental management can implement the National 6 emission limits ahead of schedule.

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Can modified exhaust systems be registered?

Modified exhaust systems can be registered. Article 10 of the "Regulations on the Registration of Motor Vehicles" stipulates that for a registered motor vehicle under any of the following circumstances, the owner of the motor vehicle shall apply to the vehicle management office at the place of registration for modification registration: 1. Nature: A commercial motor vehicle is changed to a non-commercial motor vehicle or vice versa, or other changes in the nature of use. 2. Jurisdiction: The residence of the motor vehicle owner moves out of or into the jurisdiction of the vehicle management office. An application for modification registration can be made to the vehicle management office at the place of registration. For modifications specified in items (1), (2), and (3) of the first paragraph of this article, the motor vehicle owner shall apply to the vehicle management office for modification registration within ten days after the modification.

What does variable speed detection on highways mean?

Variable speed detection on highways involves six operational processes: meteorological monitoring and alerting, travel control activation, public announcement reminders, evidence collection and synthesis, data review and entry, and violation notification and penalties. Relevant information is as follows: 1. Introduction: Speed detection determines whether a vehicle is speeding by calculating its average speed. Specifically, it refers to two adjacent monitoring points on the same road section. When a vehicle passes these two points, its speed is recorded, and the system calculates the average speed to determine if the vehicle is speeding. 2. Function: It enables automatic monitoring and warning of meteorological information, dual evidence collection for violating vehicles, and automated comparison of violation data.

How often should a newly obtained driver's license be renewed?

The first renewal for a newly obtained driver's license is required after 6 years, the second renewal after 10 years, and the third renewal results in a long-term driver's license. According to Article 26 of the "Regulations for the Implementation of the Road Traffic Safety Law", the following provisions apply: 1. 6-year validity period: If the motor vehicle driver has not reached 12 points in any scoring cycle during the 6-year validity period of the motor vehicle driver's license, the driver's license will be renewed with a 10-year validity period. 2. 10-year validity period: If the motor vehicle driver has not reached 12 points in any scoring cycle during the 10-year validity period of the motor vehicle driver's license, the driver's license will be renewed with a long-term validity.

What is the following distance when exceeding 100 km/h on the highway?

When exceeding 100 km/h on the highway, the following distance should be more than 100 meters. Relevant information is as follows: 1. Introduction: When a motor vehicle is driving on the highway and the speed exceeds 100 km/h, it should maintain a distance of more than 100 meters from the vehicle in front in the same lane. When the speed is below 100 km/h, the distance from the vehicle in front can be appropriately shortened, but the minimum distance should not be less than 50 meters. 2. Note: When driving on the highway under low visibility weather conditions such as fog, rain, snow, dust, or hail, the highway management department should issue speed limits, maintain distance, and other prompt information through displays.

What is the maximum speed when visibility is 50 meters on the highway?

When driving on the highway with visibility within 50 meters, the maximum speed must not exceed 30 km/h. Relevant information is as follows: 1. Note: Driving on the highway must strictly adhere to the principle of lane separation and each vehicle staying in its own lane. It is not allowed to cross lines, change lanes, or ride on the lane dividing line. 2. Regulations on the maximum and minimum speeds on the highway: The minimum speed must not be less than 60 km/h, and the speed must not exceed 120 km/h. When driving under adverse weather conditions, the driver must reduce speed according to the conditions and speed limit signs.

How much speeding is allowed on highways?

Speeding is not allowed on highways, and motor vehicles must not exceed the speed limit. According to the law, driving a medium-sized or larger passenger or cargo vehicle or a school bus at a speed exceeding 20% of the prescribed limit, or driving on a highway at a speed exceeding 50% of the prescribed limit, will result in a one-time deduction of 12 points. Driving a medium-sized or larger passenger or cargo vehicle, school bus, or hazardous materials transport vehicle on a highway or urban expressway at a speed exceeding the prescribed limit by less than 20%, or driving such vehicles on roads other than highways or urban expressways, or driving other motor vehicles at a speed exceeding 20% but less than 50% of the prescribed limit, will result in a one-time deduction of 6 points. Driving a medium-sized or larger passenger or cargo vehicle or hazardous materials transport vehicle on roads other than highways or urban expressways, or driving other motor vehicles at a speed exceeding the prescribed limit by less than 20%, will result in a one-time deduction of 3 points.

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