It is the responsibility of each person visiting a rock art site to leave it as they found it.

 Do not disturb it in any way.  Do not touch it. The oils on your fingers can contribute to the demise of petroicons.

 Do not step on it. Do not camp near it. 

 Vandalism and unintentional destruction are growing problems at many rock art sites around the world.  Graffiti with spray paint is very difficult to remove.

 Respect the fact that in many places where petroglyphs and pictographs occur, the sites are still considered "sacred" by indigenous peoples.  Your voice level may effect other visitors' experience.

 Always obtain permission before visiting sites that are on nonpublic lands.   Pay attention to posted signs--there are some sites on missile ranges.  Of course, signs, such as "CLIFF", should be heeded.

 Below is a link that does a comprehensive job of defining proper etiquette in relation to rock art.

http://www.europreart.net/guide.htm

There are many forces at work in the modern world, such as the building of freeways, that threaten the preservation of rock art sites. 

Conscientious participants in the science of petroiconology contribute to efforts to thwart attempts to destroy threatened sites.