I see these automatic door signs everywhere. Maybe because I'm in the safety signs industry I notice them more.
I was coming out of Sainsbury's the other day and they had 6 of them on one set of doors. I then nipped into town and the car park doors had 4 (in pink), the shopping centre had 4 of them on one set of doors. Now that you have read this, you may notice them more when you are out and about.
I just wanted to mention the special offer we have on until Mon 19th Feb 2018. You can purchase 10 of these-self adhesive automatic door signs for £5. If your total order is under £75 then postage is £2.99 whilst orders over £75 to mainland UK is free.