I received a reply from the Federal Highway Administration on April 15th. Not bad for a letter I wrote on March 23rd. For background, please see the first blog on this subject.
Their reply stated that “One study specifically investigating the legibility of sign with newer headlamp technolgy and external lighting found there are no practical differences in the ability of a person (regardless of age) to read the sign regardless of the external lighting applied.”
If that was only “One study,” then what have other studies shown? And what are “practical differences”? Are they significant or not?
They also claim that there are safety risks in that maintenance workers who service external lights are at risk. Are such workers at more or less risk than drivers who rely on the legibility of such signs 24/7 every day of the year?
Bottom line: Buraucracies can justify anything that suits its objective.