What is the speed limit for a three-lane highway?

[DiGeorge]

On a highway with three lanes, the speed limits from the leftmost lane are generally as follows: First lane: 100-120 km/h (overtaking lane); Second lane: 90-110 km/h (travel lane); Third lane: 60-100 km/h (truck lane); Fourth lane: emergency lane. Article 78, Paragraph 3 of the Implementation Regulations of the Road Traffic Safety Law stipulates: For roads with two lanes in the same direction, the minimum speed on the overtaking lane is 100 km/h; for roads with three or more lanes in the same direction, the minimum speed on the overtaking lane is 110 km/h, the minimum speed on the travel lane is 90 km/h, and the speed on the deceleration lane should not exceed 50 km/h. If the speed indicated by road speed limit signs differs from the above lane speed regulations, drivers should follow the speed indicated by the road speed limit signs. These are the general speed limits for highways with three lanes. If the highway section involves special conditions such as ramps or slopes, there may be additional speed limit regulations. The speed limit on slopes depends on the length and angle of the slope as well as traffic volume, while the speed limit on ramps is 40 km/h. As for curves on highways, generally no speed reduction is required, which is related to the design standards of curves in China. The design of highway curves follows certain standards. On highways in plains or hilly areas, the minimum curve radius is 650 meters, while on mountainous highways, it is 250 meters. When a vehicle passes through a curve at 120 km/h, the centrifugal force generated does not exceed 0.2g, whereas most cars can withstand a centrifugal force of at least 0.5g, so reducing speed is unnecessary. Pedestrians, non-motorized vehicles, tractors, wheeled special machinery vehicles, articulated buses, full trailers, and other motor vehicles with a design speed below 70 km/h are not allowed to enter highways. The maximum speed indicated by highway speed limit signs must not exceed 120 km/h. When entering the highway acceleration lane from a ramp, drivers must turn on the left turn signal and merge into the travel lane without obstructing vehicles already on the highway. The fourth lane, commonly known as the emergency lane, is reserved for emergency vehicles only, including police cars, fire trucks, ambulances, and engineering rescue vehicles during emergency operations. Vehicles with sudden malfunctions or passengers with sudden illnesses may also use the emergency lane. Other vehicles are prohibited from stopping or driving in the emergency lane unless under emergency conditions. Precautions: When driving on highways, pay attention to traffic signs and do not exceed the indicated speed limits. In cases of snow, rain, fog, wet or icy roads, or poor visibility, reduce speed to a safe level and maintain a safe distance. Avoid speeding or frequent overtaking to prevent accidents. When driving on highways under low visibility conditions such as fog, rain, snow, or hail, the following rules apply: If visibility is less than 200 meters, turn on fog lights, low beams, marker lights, and front and rear position lights, keep speed below 60 km/h, and maintain a distance of at least 100 meters from the vehicle ahead in the same lane. If visibility is less than 100 meters, turn on fog lights, low beams, marker lights, front and rear position lights, and hazard warning lights, keep speed below 40 km/h, and maintain a distance of at least 50 meters from the vehicle ahead in the same lane. If visibility is less than 50 meters, turn on fog lights, low beams, marker lights, front and rear position lights, and hazard warning lights, keep speed below 20 km/h, and exit the highway at the nearest available exit.