Three lanes shift left, then right
Thai road sign ตก.17 — Three lanes shift left, then right. Meaning: Three traffic lanes shift left and then return to the right through the work zone. 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 three lanes shifting left and returning right. Use this independent reference to recognise Three lanes shift left, then right. Compare its shape, colour, symbols and arrows with nearby warning and work-zone signs.
Study guide
Related signs
Compare Three lanes shift left, then right 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.
