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From: "Robbie Banks"
Subject: Re: Smart traffic lights
Date: Mon, 13 Jan 2003 12:07:35 -0000
NNTP-Posting-Date: 13 Jan 2003 12:07:37 GMT
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
"WildOne" wrote in message
> On 3 Jan 2003 00:04:48 -0800, email@example.com (Robin) wrote:
> >This may be a UK thing only but traffic lights here have the habit of
> >changing for no reason. Through-traffic will be moving along nicely
> >and then suddenly the lights will change. Everything stops. And waits.
> >Nothing happens on the green-light side, no traffic, nothing and then
> >equally as suddenly the lights change back.
This is Highways Agency regulation. There is a maximum running phase length
for any given flow before the lights have to switch to an opposing flow. The
reasoning being that a car may be stranded due to stalling on it's green
turn. The Max running of green on any one phase is 60 seconds usually, it
will then change and show green on the other phase for a minimum of 12
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