 A closely related justification emphasizes that the pursuit of health is not possible without ground rules for coordinated action and near-universal participation. Thus, public health is viewed as having the structure of a coordination or collective efficiency problem. If one person (or at least, a sufficient number of such persons) decides to go when the traffic light is red and stop when the traffic light is green, it does not matter that everyone else is following the rules: this person will disrupt the smooth functioning of the system, with potentially dangerous results. Similarly, if one person (or a sufficient critical mass of such persons) decides not to abide by a public health regulation because the regulation does not directly benefit her or she otherwise objects, the ramifications will likely be felt by others in her environment and  beyond.[19]  Almost everybody has to participate because, failing their involvement, neither they nor anyone else is likely to be as healthy as they might otherwise be, and none can fully reap the benefit of a healthy society.