| Message count | Campaigns with 1 message saw a 4.4% lift in the key brand association. With 2 messages: 2.0%. With 3: a 0.4% decline. | Double Take (73 campaigns) | Pick the 1 thing the airport audience should remember. Product lists belong on the landing page. |
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| Word count | Fewer than 7 words: 70% recognized the brand in 2 seconds. More than 7: 59%. | Double Take (150 campaigns) | Hold every walk placement to 7 words. Count the logo line and the URL. |
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| Logo position | Ads with the main brand asset at the top had about 2.7 times the odds of above-average recognition. JCDecaux separately reports 32% higher brand recall for top logo placement. | Double Take (150 campaigns); JCDecaux design guide | Put the brand in the top of portrait screens and the leading edge of landscape ones, where reading starts. |
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| Logo size | Ads whose logo covered at least 10% of the creative were viewed 28% longer. | Double Take | Airport sightlines are long. A logo sized for a magazine page disappears from across a concourse. |
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| Number of brand assets | On System1's Spike rating, which combines 2-second recognition and emotional intensity, ads using 1 brand asset scored 1.69. Ads using 6 scored 0.91. | Double Take (150 campaigns) | Choose 1 or 2: the logo plus a shape, a character, or a color. Not the whole brand book. |
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| Color and contrast | Ads using vibrant color showed a 22% higher emotional response. | Double Take; JCDecaux design guide | Terminals are bright, neutral, and full of signage. Saturated color and hard contrast are what separate an ad from wayfinding. |
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| Product or image size | Doubling product size went with 86% longer average viewing time. Products filling half the creative or more earned 38% more attention. | Double Take; JCDecaux design guide | 1 object, large. For software and services, 1 shape or 1 face in place of a screenshot. |
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| Faces and characters | Ads showing people were viewed longer than ads with any other feature. Ads with a recognizable brand character had 3 times the odds of fast recognition. Ads leaning on a celebrity had half the average odds. | Double Take (150 campaigns) | A face looking at the traveler beats an abstract pattern. A known brand character beats a borrowed famous one. |
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| Emotion | The least dull third of campaigns were recalled by about 30% of people. The dullest third: 18.9%. | Double Take (73 campaigns) | B2B is not an exemption. A line with some wit travels further than a category description. |
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| Consistency with other channels | Out-of-home that matched the TV campaign showed 14% higher 2-second recognition and 30% higher recall. | Double Take | Use the look of the campaign the traveler has already seen on LinkedIn, TV, or at the conference. |
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| Context | Contextually relevant campaigns achieved a 17% stronger audience response on average. | JCDecaux design guide, citing a 2019 JCDecaux, Clear Channel, and Posterscope study | Name the moment where it fits: arriving, boarding, the event in town. Keep the brand and the line fixed. |
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