What are the four lanes in two directions?
2 Answers
Four lanes in two directions refer to a total of four lanes combined for both directions. For example, there are two lanes heading south and two lanes heading north in the opposite direction. Lane establishment standards: For a four-lane highway in two directions, each lane is 3.75 meters wide, with a mandatory green belt in the middle. The shoulder (emergency stopping area on the highway) is 1.5-2.5 meters wide. Each toll lane at a highway toll station is 2.5 meters wide, and an extra-wide toll lane of 3.5 meters or more must be established when necessary to ensure smooth traffic flow. Lane speed and functions: A four-lane highway in two directions is designed for speeds of 120 km/h or higher, with a road width accommodating four lanes. A median divider is installed, using high-grade pavement materials like asphalt concrete or cement concrete, and is equipped with complete signage, markings, signals, and lighting. Pedestrians and non-motorized vehicles are prohibited from using the road, with crossings facilitated via overpasses, underpasses, or pedestrian bridges at intersections with other routes.
I often drive on dual four-lane roads, which means a road is divided into two directions with two lanes in each direction, totaling four lanes. For example, this design is common on urban arterial roads or highways, where traffic is separated to avoid congestion, and overtaking is easier when driving at high speeds. I've tried it myself on highways and found the view open, the markings clear, and the driving smooth. Compared to dual two-lane roads, it reduces the risk of oncoming vehicles, making it much safer. However, with more lanes, beginners might get confused and need to check road signs in advance. Some roads also have emergency lanes or dedicated bus lanes, which are quite practical. This design is suitable for medium to high traffic areas and can improve overall traffic efficiency.
