What Makes a Billboard Advertising Memorable in an Era of Short Attention Spans?

Billboard advertising stays memorable in the short-attention-span era by doing less, not more: one message, one visual, minimal text (under 7 words), high-contrast bold design, and location-relevant context (highway vs transit vs mall messaging differs). Add an emotional or humour hook - since witty boards get talked about and shared, extending reach beyond just physical visibility. The winning formula is simplicity + relevance + recall, not information density. Bonus points for tying it to digital (QR codes, hashtags) so impact becomes trackable, not just anecdotal.