Construction machinery ahead
Thai road sign ตก.4 — Construction machinery ahead. Meaning: Construction machinery is working ahead on or close to the carriageway. 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 warning sign showing construction machinery. Use this independent reference to recognise Construction machinery ahead. Compare its shape, colour, symbols and arrows with nearby warning and work-zone signs.
Study guide
Related signs
Compare Construction machinery ahead 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.
