A "large billboard" refers to a very big sign that is usually located by the side of a road or building. It is used to display advertisements or important information so that many people can see it easily. Full definition
Recently, Michael Pehl of i - Cube, an IT - consulting - services company in Cambridge, Mass., began running a series of large billboards in the Boston area, including one targeting drivers exiting from Logan Airport that immodestly touts i - Cube as «An Incredible Place to Work.» (inc.com)
One Times Square, once home to the New York Times and now the focal point for the Times Square New Year's Eve ball drop, is almost entirely empty with few tenants; the majority of the revenue the building's owners take in is from the many large billboards on the exterior of the building. (howtogeek.com)
Google is going big this holiday season as the first company to rent out Times Square's largest billboard ever. (entrepreneur.com)