Free images results:
 

Exit pictures, stock photos and images

 
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Blue Door Royalty Free Stock Photos
Author: Barsik
Gate Royalty Free Stock Images
Author: Michaf
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Cave exit Royalty Free Stock Photography
Author: Toshi12
Exit Stock Photos
Author: Ollirg
Exit sign Royalty Free Stock Photo
Author: Nero67