Let's have a look to a common signal in UK which is placed on doors: Fire escape / Keep clear. 
1. Look for an equivalent sign in your country and take a picture of it. 
2. Compare the sign in your country with the above signs. 
    -What is the equivalent for the phrase "Keep clear" in your country? 
    -Are the colours used in the UK and in your country the same?  
Looking forward to see your pictures and hear your comments! :)

 
                           