Why can't you drive straight in a lane with sawtooth markings?

[Salvador]

A lane formed by sawtooth markings is a variable lane, so driving straight is not allowed. Here is some relevant information about lanes: 1. Introduction: A lane, also known as a traffic lane or carriageway, is a designated path on a road for vehicles to travel. Lanes are set up on both regular roads and highways, with highways having legal regulations for lane usage, such as travel lanes and overtaking lanes. 2. Lane pavement markings: In many countries, lane markings appear on the road surface. The most common markings are directional arrows. In China, starting with the Beijing Airport Expressway, all newly built highways have ground lane markings, especially those related to speed limits. The maximum speed limit is indicated in orange, while the minimum speed limit is shown in white. Newly opened sections of the Southwest Sixth Ring Road, which began operation in 2004, also have ground speed limit markings. The Beijing section of the Jing-Shi Expressway has also implemented lane-specific speed limits.