I quite like it when smart advertising is combined with Public Transport. This one is from Stockholm and is to promote hair products and is done by using ultrasonic sensors to detect the arrival of trains.
h/t: The Atlantic Cities
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Brilliant, absolutely brilliant!
Haha! Can you believe it, but I never even noticed those and I pass through the stations pictured (östermalmstorg, T-Centralen, Hötorget etc) nearly every day! I’ll have to see if they’re still there!