From: Jim Thompson
Subject: Re: Smart traffic lights
References: <firstname.lastname@example.org> <3E24292D.4F73D0BA@boeing.com>
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Date: Tue, 14 Jan 2003 15:44:03 GMT
NNTP-Posting-Date: Tue, 14 Jan 2003 10:44:03 EST
Organization: Cox Communications
On Tue, 14 Jan 2003 15:13:49 GMT,
Paul Hovnanian ,
In Newsgroup: sci.electronics.design,
Entitled: "Re: Smart traffic lights",
Wrote the following:
|Robbie Banks wrote:
|> "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
|We have an interesting variation on this problem near where I live.
|is a freeway off-ramp with a traffic light and an 'on-demand' pedestrian
|crossing at the end. The kind where you have to push a button to cross.
|Normally, the cycle on this light gives off-ramp traffic a pretty
|duty cycle in order to keep traffic moving. This changes when a
|pushes the crossing button. Normally, this happens quite infrequently,
|there isn't anything within practical walking distance of this
|Recently, some panhandlers have taken to setting up at this intersection
|with their cardboard signs. In order to extend the period in which cars
|stopped at the light and are available for handouts, they have figured
|how to jamb the pedestrian crossing button 'on' full time.
I Arizona, all the grounds around freeway ramps have now been recently
marked "State Property, No Trespassing". The DPS officers just
periodically swoop in and arrest their asses.
Of course a lot of the panhandlers aren't homeless. They caught one
here a few years ago who was dropped off and picked up by a limo ;-)
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| Jim-T@analog_innovations.com Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
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