In Spain it is not mandatory to use of daytime running lights (DRL) . After my Swedish and Latvian experience (places where is compulsory to use DRL), I am a strong supporter of DRL. And today, I have found the support movement in Spanish: http://www.luces24horas.com (Thanks for the photo!). Maybe this slides (in Spanish, about benefits of DRL ) would help you to know more about it: What do you think about daytime running lights? There is also a Association of Drivers Against Daytime Running Lights