Yes, there are several potential issues that one might observe regarding the poster on the back of a semi-trailer. First, it could be a matter of clarity: if the message or image on the poster is difficult to read while on the move, it defeats its purpose as an advertising medium. Additionally, if there are any grammatical errors or confusing imagery, this could lead to misunderstandings about the promoted product or service.

Another concern might be the appropriateness of the content; the poster needs to be suitable for all audiences, especially since it is viewed by a diverse mix of people on the road. There’s also the question of compliance with advertising regulations and standards that govern what can be displayed on vehicles.

Lastly, if the poster does not resonate with the target audience or creates a negative impression of the brand, that would also be a significant issue worth noting. Overall, it’s crucial for advertising materials, especially ones displayed prominently on vehicles, to be effective, clear, and appropriate.