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Article #2853Re: Sticky Demand Traffic Light problem solution
From: Erick L. Parsons
Date: Tue, 14 Apr 1992 02:28
Date: Tue, 14 Apr 1992 02:28
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4681 bytes
In article <10175@inews.intel.com> dpeterso@mipos2.UUCP (David Peterson) writes: >In article <1992Mar31.190727.2381@ncsu.edu> steve@bucolix.ece.ncsu.edu (Steve Garnier) writes: >>In article <peterd.702047076@pjd.dev.cdx.mot.com> >>peterd@pjd.dev.cdx.mot.com (Peter Desnoyers) writes: >> ... stuff deleted ... > >I just remembered something - when I attended U.C. Davis some >signals around town had bike sensors, sensors in bike lanes >made to detect bicycles. Ask local athorities, maybe adjustments >could be made :^). Then again you probably would have to get >half the population to threaten a recall vote to get a city >council to do anything for the general population ;-(. >------------------------------------------------------------------------- >David Peterson >Intel Corp., M/S SC4-69, 2625 Walsh Ave. >Santa Clara, Ca. 95052-9940 >dpeterso@mipos3.intel.com >Dave Peterson >SC4-69 >765-5109 >dpeterso@mipos3 I work for Sacramento County as a traffic signal technician and can tell you that there are in fact street sensors that will pick up a bicycle. As a matter of fact almost all of the sensors or loops as we call them will sense a bicycle, though the threshold of dection is only gauranteed for a motor bike the size of a honda 90. There is one intersection (close to a college) that was used as a test case to put a pedestrian call in to accomodate bicycles (in the provided bike lane). But, pedestrians move slower than bicycles. You might have noticed while driving around that a signal appears to be stuck red for you when there is no traffic coming in any direction; well this is usaually because a bicycle rider pressed the pedestrian push button to cross the street. The bicyclist gets his/her signal to walk but the Intersection controller can only assume that there is a pedestrian there. It will stop all traffic to let the supposed pedestrian to cross when in fact the bicycle rider will zip across the intersection in a fraction of the time alloted for the pedestrian. Are ya with me so far ?. The problem with this is a major interuption in traffic flow, yes, even during rush hour. In a City the size of Davis (small) this might be OK, but in a city the size of Sacramento this just doesn't cut it. Traffic is a priority and pedestrians are a necessary evil when it comes to getting the commuter home. Hence it never became popular here, or proabably anywhere for that matter. I am familiar with Davis as it is only 10 or so miles from here (Sac.). I am also aware of the fact that Davis is a bicyclist's dream which is great, but one must not compare apples with oranges when thinking in terms of traffic control or local authorities answers to solving traffic problems. In short I wouldn't want you to get your hopes up when it concerns bicycle control at automobile oriented signalized intersections. As things here in California get more and more congested the demand to move people in cars will become more and more critical to the people who make the decisions. As a matter of fact bicycles are being viewed as automobiles, note the change in law concering which side of the road the bicyclist must ride on, in Californial it is with the flow of traffic. Pedestrians must walk against the flow of traffic. This is a monumental distinction concerning bicycle riders as it relates bicycles to automobiles. Case in point, I witnessed a bicylist getting hit by an automobile. After giving my deposition I was informed that the bicyclest was at fault and had to pay for the damage to the drivers automobile. Why, you might ask, the bicyclist was riding his bike on the wrong side of the road. Realize: the facts stated here are as I, myself percieve them and not necessarily the views of the County of Sacramento. L8tr....o .e -- ------------------ // -----------Cut-Here---------------------------------- Erick Parsons // Words for the wise: *If it works don't fix it.* Sacramento Ca // mail to: ...pacbell!sactoh0!americ!erk
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Path: arc1-ca.pugleaf.net!sparky!uunet!cs.utexas.edu!swrinde!mips!news.cs.indiana.edu!umn.edu!csus.edu!csusac!sactoh0!erick From: erick@sactoh0.sac.ca.us (Erick L. Parsons) Newsgroups: sci.electronics,rec.bicycles,rec.motorcycles Subject: Re: Sticky Demand Traffic Light problem solution Keywords: inductive vehicle detectors, traffic lights Message-ID: <1992Apr14.022807.17300@sactoh0.sac.ca.us> Date: 14 Apr 92 02:28:07 GMT References: <peterd.702047076@pjd.dev.cdx.mot.com> <1992Mar31.190727.2381@ncsu.edu> <10175@inews.intel.com> Distribution: na Organization: Sacramento Public Access Unix, Sacramento, Ca. Lines: 74