Consideration for motorist safety mandates the establishment of criteria for maintaining effective signing in the event of detrimental factors such as adverse weather conditions, ambient lighting conditions and power failures.
In this study, research undertaken by twenty four states/agencies was reviewed and information on current practices concerning illumination and reflectorization of overhead signs was collected to define the most effective sign treatment to be used.
The study concludes that the best alternative for sign treatment incorporates both reflectorized background and external illumination.
