Left lane merges into two lanes
Thai road sign ตก.21 — Left lane merges into two lanes. Meaning: A left-side lane merges into two through lanes. Learner-manual coverage: this identity is shown in the current DLT car-driver learner manual. Inclusion does not mean it appears in every theory test.
Study guide
Use this reference with practice
Orange diamond work-zone sign showing a left-side lane merging into two lanes. Use this independent reference to recognise Left lane merges into two lanes. Compare its shape, colour, symbols and arrows with nearby warning and work-zone signs.
Study guide
Related signs
Compare Left lane merges into two lanes with nearby warning signs. Shape, colour, symbols, arrows and wording distinguish each identity.
Put sign knowledge into practice.
Use broader signs-and-signals practice to apply the visual distinctions reviewed in this independent reference.
