Xref: utzoo comp.cog-eng:641 comp.software-eng:823 Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!nosc!ucsd!nprdc!trejo From: trejo@nprdc.arpa (Leonard J. Trejo) Newsgroups: comp.cog-eng,comp.software-eng Subject: Re: Colors of traffic signals (Was Re: OPEN LOOK) Message-ID: <895@arctic.nprdc.arpa> Date: 19 Sep 88 04:54:11 GMT References: <7099@well.UUCP><8501@smoke.ARPA> <890@arctic.nprdc.arpa> <23293@wlbr.EATON.COM> Sender: news@nprdc.arpa Reply-To: trejo@nprdc.arpa (Leonard J. Trejo) Organization: Navy Personnel R & D Center Lines: 42 In article <23293@wlbr.EATON.COM> mh@wlbr.eaton.com.UUCP (Mike Hoegeman) writes: >In article <890@arctic.nprdc.arpa> trejo@nprdc.arpa (Leonard J. Trejo) writes: > >In article <8501@smoke.ARPA> geoffs@brl.arpa (Geoffrey Sauerborn (TANK) ) writes: > >> RED is safer than BLUE for stops since it can be seen more > >>easily. (But White is even better than RED for that reason - but that is > >>why it is used for headlights). > > > >This is rubbish. What is seen most easily depends on many visual > >factors other than wavelength. Size, retinal eccentricity, > >background, adaptation level, and temporal properties are a few of...etc. > >...more optometrists-on-their-lunch-hour-type talk here.... ^^^^^^^^^^^^ If I were an optometrist I'd have signed my posting as O.D., not Ph.D. I'm a research psychologist. > > >OH COME ON!! Geoffrey was just trying to make the point that things >like scroll bars are such a basic tool that there is probably some >merit in defining a standard way of operating one. The stoplight >analogy was just poking fun at the original poster's high and mighty >vehemence at someone having the gall to try and make a set of >guidelines for such a thing. Nothing more nothing less. My reading of Geoffrey's message picked up the sarcasm intended for the 'OPEN LOOK' poster. However, mixed in with the sarcasm were some authoritative sounding statements about, for example, which colors are seen better. Having observed how easily wrong information is picked up and passed around, especially about color vision, I felt it necessary to respond. In doing so, I came across very officiously myself, and it seems I goofed about blue light not traveling farther than red in our atmosphere. For these errors, I apologize. L. J. T. ============================================================================ ARPANET : trejo@nprdc.arpa UUCP: ucsd!nprdc!trejo Phone: (619) 553-7981 Postal Address: Leonard J. Trejo, Ph. D. (AV) 553-7981 NPRDC Code 52 San Diego, CA 92152-6800