You see a large lorry with plain orange reflective plates on the front and rear. What does this most likely tell you about the vehicle?

Explanation

According to the Highway Code, Rule 284, vehicles carrying dangerous goods in packages are marked with plain orange reflective plates. Road tankers and vehicles with tank containers of dangerous goods use more detailed hazard warning plates. Seeing plain orange plates on a lorry indicates it is carrying dangerous goods in packages, so you should be especially cautious around it.