What does the sawtooth pattern on highways represent?

[KaiLynn]

Highway sawtooth markings indicate variable lanes. Below are important safety precautions for highway driving: 1. Stay informed about road conditions. Before traveling, it's crucial to obtain up-to-date traffic information. If TV and radio reports aren't timely enough, you can call highway information hotlines. This is particularly important during foggy seasons - verify conditions in advance to avoid unnecessary detours or exits. 2. Avoid fatigued driving. Highways' enclosed environments encourage higher speeds, requiring prolonged concentration. The fixed driving posture and monotonous operations can easily cause both mental and physical fatigue. Poor weather conditions further increase accident risks. Therefore, drivers should take breaks approximately every 2 hours to maintain alertness. 3. Never speed. Speeding is a major cause of traffic accidents. During adverse weather, drivers must strictly adhere to speed limits, refrain from aggressive driving or right-side overtaking to ensure everyone's safety and property protection.