What are the drawing method and dimensions of an S-curve?
1 Answers
S-curves consist of two turns, first left then right. Each turn is composed of two concentric circles, with the curve length being 3/8 of the arc length. The large circle has a radius of 7.5 meters, and the small circle has a radius of 4 meters. The large and small circles of the two curves are tangent to each other, meaning the two curves share the same axis. To draw a standard S-curve, at least a 12m*8m open space is required. Tips for the S-curve in Subject 2 of the driving test: Use the rearview mirror as a reference. During driving, use the relative distance between the rearview mirror and the S-curve boundary line as a guide. It's acceptable as long as the distance is roughly consistent. Whether to drive close to the line or maintain a certain distance can be adjusted based on personal circumstances. Using the rearview mirror as a reference, the optimal entry point into the curve is when the body of the car is positioned one-third from the right side. This provides greater room for error when changing direction at the junction of the two curves in the S-curve. Method for observing the car hood during the S-curve in Subject 2: When observing the car hood, simply use the outermost edge of the hood visible in your line of sight as a reference. There's no need to stretch your head to look at a specific point. Depending on individual vision, you can choose a position one-third from the left or right of the hood, the middle, or any other suitable position. During driving, the S-curve should remain near the chosen reference point. If the reference point is not the middle of the hood, you will need to change the reference point as the curve changes—look at the right side of the hood for left turns and the left side for right turns. If using the middle position, this adjustment is unnecessary.
