How can signal visibility be improved?

Improving signal visibility is crucial for ensuring that drivers can easily see and interpret traffic signals. Maintaining clear sightlines and cleaning lenses directly addresses a fundamental aspect of visibility: clarity. When signal lenses are clean and free from obstructions, such as dirt, debris, or vegetation, the signals can be seen more clearly from a distance. Clear sightlines further ensure that nothing obstructs the view of the signals, enhancing the likelihood that they are noticed and interpreted correctly by drivers.

While implementing more signals, using brighter colors, and increasing signal height may seem like viable options to improve visibility, they do not address the immediate factors that affect how well a signal can be seen. For instance, adding more signals might lead to confusion in certain situations, and brighter colors could be less effective if the lenses are not clean or if there are obstructions in the way. Increasing signal height can improve visibility to some extent but doesn't guarantee that the signal remains unobscured or effectively viewed from all angles. Thus, the most effective means of ensuring signals are visible is through vigilant maintenance of their conditions and ensuring they are positioned to avoid visual obstructions.