A warning must inform individuals of a danger which would not be obvious to them. It must tell them how to avoid the danger, and be easily understood. It should also provide them with the consequences of not heading the warning. In order to achieve these objectives, the warning should be well visible and capture attention. Thus, it should be placed where individuals may be expected to see it during the normal course of their activity. Hence, it is better to place a warning at a potentially dangerous location, which confronts the user constantly, rather than where it will only be encountered occasionally.