Final answer:
A trend in billboard advertising is ads that change or rotate to other messages on the sign.
Step-by-step explanation:
A trend in billboard advertising is ads that change or rotate to other messages on the sign. This trend allows advertisers to display multiple messages on a single billboard, increasing the effectiveness of their campaigns. For example, a billboard might display different advertisements throughout the day, targeting different audiences depending on the time of day or location. This technique is often used to promote multiple products or services from the same company.
Learn more about billboard advertising