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Article #523Re: red light camera question
From: Paul S. Wolf
Date: Tue, 05 Jun 2001 23:27
Date: Tue, 05 Jun 2001 23:27
26 lines
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2752 bytes
Paul R wrote: > > Is there a standard for how long a yellow is supposed to last? Like 2 > seconds? 5 seconds? 10 seconds? I guess this translates into "Just > how hard am I supposed to stomp my brakes to get stopped?" Please > note: I agree that Yellow means "Stop if safe to do so", but without > I knowledge of how long the yellow is, how do I know what that means? > > Paul R There is no fixed length. The Yellow is calculated based on the speed of traffic, width of the intersection, perception time factors, and sometimes the distance between the detector and stop line. TYPICAL lengths are between 3 and 5 seconds. If the yellow is much longer than that, then people will assume the signal is malfunctioning. If a longer clearance period is needed, the All-Red period can be used or extended. The "dilemma" zone is one of the hardest factors to calculate when developing a timing pattern for signals, especially on high speed rural or suburban highways. -- Paul S. Wolf, PE mailto:Paul.S.Wolf@alum.wpi.edu Traffic Engineer, Cuyahoga County Engineer's Office, Cleveland, Ohio
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 1011e5,bf5785b4a0554983 X-Google-Attributes: gid1011e5,public X-Google-Thread: fb785,3713032fc760589c X-Google-Attributes: gidfb785,public X-Google-Thread: 11299e,bf5785b4a0554983 X-Google-Attributes: gid11299e,public X-Google-ArrivalTime: 2001-06-05 16:28:10 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!newsfeed.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!news.stealth.net!news-east.rr.com!news.rr.com!router1.news.adelphia.net!news1.news.adelphia.net.POSTED!not-for-mail Message-ID: <3B1D6A91.F737FA93@alum.wpi.edu> From: "Paul S. Wolf" <paul.s.wolf@alum.wpi.edu> Reply-To: paul.s.wolf@alum.wpi.edu Organization: The US Scouting Service Project, Inc. (USSSP) X-Mailer: Mozilla 4.77 [en] (Win95; U) X-Accept-Language: en MIME-Version: 1.0 Newsgroups: va.general,alt.law-enforcement.traffic,dc.driving Subject: Re: red light camera question References: <df481569.0106011937.745d838@posting.google.com> <3B1861D0.6A5EC313@ix.netcom.com> <9fc7gg$4fq$1@murdoch.acc.Virginia.EDU> <sdenht0r4isciqu542beqvm80um0rss2aj@4ax.com> <9fgi9u$ncv$8@newsmaster.cc.columbia.edu> <qdbohtga7jp1f4av4i0gtgp10a848il836@4ax.com> <VzWS6.526$yX.139911@bgtnsc07-news.ops.worldnet.att.net> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 26 Date: Tue, 05 Jun 2001 23:27:23 GMT NNTP-Posting-Host: 24.50.196.149 X-Complaints-To: abuse@adelphia.net X-Trace: news1.news.adelphia.net 991783643 24.50.196.149 (Tue, 05 Jun 2001 19:27:23 EDT) NNTP-Posting-Date: Tue, 05 Jun 2001 19:27:23 EDT