How is a sharp curve defined?
2 Answers
Sharp curve refers to a curve with a horizontal curve radius of less than 50 meters. Sharp curve to the left: The sharp curve to the left traffic warning sign is set at an appropriate position in front of the road with a sharp left turn. The sharp curve to the left traffic warning sign is mostly found on mountain roads. Mountain roads are a high-risk area for accidents, extremely dangerous, so it is essential to drive slowly when going up or down the mountain. Driving precautions: Develop the habit of fastening your seat belt when driving, and make sure the car door is closed tightly while driving. When passing through the intersection of the main road and the auxiliary road, pay attention to slowing down. If you are not sure whether there is a car coming out of the intersection, you must slow down and pass slowly. Always use the turn signal when changing lanes.
From a highway design perspective: sharp bends are not arbitrarily determined by feeling. I've checked the road design standards, which mainly consider the turning radius and design speed. For example, in urban roads, a turning radius of 250 meters or less is considered a sharp bend, while in mountainous areas, it's relaxed to 125 meters. The most extreme are those sharp bends with angles less than 70 degrees where you can't see oncoming traffic—road authorities install convex mirrors on the roadside. During construction, superelevation is also designed for curves, tilting the outer road surface to facilitate drainage and prevent skidding. Otherwise, driving through such bends in the rain could easily lead to drifting. When navigating sharp bends, you can distinctly feel the steering wheel being pulled, and for bends with smaller radii, you need to turn the steering wheel more than half a turn to get through.
