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Topic: Traffic signals

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	Traffic light - Wikipedia, the free encyclopedia
		Traffic light failure in most jurisdictions must be handled by drivers as a priority-to-the-right intersection in Europe, or a four-way stop elsewhere, pending the arrival of a police officer to direct traffic.
		Traffic signals in most areas of Europe are located at the stop line on same side of the intersection as the approaching traffic and are often mounted overhead as well as on the right and left sides of the road.
		Upon activation the normal traffic light cyle is suspended and replaced by the "preemption sequence": the traffic lights to all approaches to the intersection are switched to "red" with the exception of the light for the vehicle that has triggered the preemption sequence.
	en.wikipedia.org /wiki/Traffic_signal (6946 words)

	Traffic Signals
		The primary function of any traffic signal is to assign right-of-way to conflicting movements of traffic at an intersection, and it does this by permitting conflicting streams of traffic to share the same intersection by means of time separation.
		When properly timed, the traffic signal increases the traffic handling capacity of an intersection, and when installed under conditions which justify its use, it is a valuable device for improving the safety and efficiency of both pedestrian and vehicular traffic.
		It is important that the selection and use of this traffic control device be preceded by a thorough study of traffic and roadway conditions and that the determination of the type of control and method of operation be based on the study data.
	www.azdot.gov /Highways/traffic/Signal.asp (613 words)

	Traffic Signals \| Street Division
		All signalized intersections are on a quarterly preventative maintenance schedule.
		The process of determining where traffic signals are installed is a complicated one.
		A point system, based on traffic flow and the accident rate at that intersection, is used to determine whether a signal is warranted.
	www.sandiego.gov /street-div/trflight.shtml (265 words)

	Traffic Signals & Signs
		The primary purpose of traffic signals is simply to assign the right-of-way at intersections that would otherwise be so congested that excessive delays to vehicles and pedestrians would occur.
		Along arterial and collector streets that have several traffic signals spaced at periodic intervals, the traffic signals are synchronized to provide coordinated movement along the main street.
		However, where the through traffic volume is considerably higher than the left turning traffic volume, the benefit to left turning traffic usually does not outweigh the increase in delay and stops for through traffic.
	www.ci.longmont.co.us /public_works/transportation/signals_signs.htm (2254 words)

	Public Works: Traffic Signals/Street Lights
		Traffic signals make sure intersecting traffic moves in an orderly fashion and assigns the right of way in situations that cannot be effectively controlled by stop signs or other devices.
		The pedestrian signals feature a short duration green walking figure, which indicates to pedestrians that it is safe to commence crossing the road.
		Traffic signals close to railway crossings: When a train approaches a railway crossing, a signal is sent to the traffic signals controlling computer.
	www.abington.org /publicworks/traffic_signals.htm (680 words)

	Historical Signals
		The worlds first traffic signal using colored lights was installed in December of 1868 at the intersection of George and Bridge Streets near the Houses of Parliament.
		TRAFFIC TOWERS- The next phase in the evolution of the traffic signal, was to employ the use of traffic towers.
		The top left signal was called the "Attica Signal" built in 1924.It was used in Harrisburg, PA and had ten small and two large indications for traffic in both directions.
	signalfan.freeservers.com /history.html (2012 words)

	Traffic Signals 4
		It's a traffic signal with vertical, diagonal and horizontal white bars on the lenses.
		The majority of traffic signals in New South Wales have a reflective white border on the target board or back board.
		Traffic facing the sign in these circumstances must stop and give way to traffic on the other road.
	www.hobbiesplus.com.au /signspotters/traffic_signals_4.htm (394 words)

	Comm Shop Info
		Traffic signals are designed and placed into operation only if they meet certain warrants as required by the MUTCD manual.
		If the signal was designed to operate as a pre timed or semi actuated signal, it could rest green until the controller allows the next phase to go green.
		If the signal is running in a coordinated string of traffic signals, it will hold green in order to maintain its coordination with the other signals.
	www.ci.missoula.mt.us /trafficservices/cominfo.htm (1128 words)

	City of Fremont - Traffic Signals
		Traffic signals are valuable and effective devices for the control of vehicle, bicycle, and pedestrian traffic.
		As traffic volumes increase beyond the capability of other control devices (i.e., all-way stop), it may be necessary to install a traffic signal.
		The primary function of a traffic signal is to assign right-of-way to conflicting traffic at an intersection.
	www.ci.fremont.ca.us /Community/Traffic/TrafficSignals.htm (775 words)

	Traffic Signals
		If a traffic signal is installed when not warranted, it may also increase the overall delay, increase the adverse effects of collisions, and reduce intersection capacity.
		A traffic signal installation may be warranted to encourage concentration and organization of traffic flow on the arterial network.
		Traffic studies have shown that excessive vehicle delay results in driver frustration and may cause disobedience to traffic signal indications which can lead to a higher accident rate.
	www.ci.rialto.ca.us /publicworks_1076.php (666 words)

	Traffic Signals (Site not responding. Last check: 2007-10-20)
		Nearly all of Mesa's signals are interconnected and operate as a system to reduce overall delays throughout the City.
		Approximately two-thirds of Mesa's traffic signals are equipped with preemption.
		An interface device in the traffic signal cabinet tells the traffic signal controller when a vehicle is present based on these inductance changes.
	www.cityofmesa.org /transportation/traffic_signals.asp (872 words)

	Traffic Signs, Signals and Traffic Control
		Signal LED Technology - Light Emitting Diodes (LEDs) for traffic signal lamps is an example of Scottsdale's commitment to innovation and cost savings.
		Signal Warrant Studies, New Signals - A thorough study is completed that analyzes the anticipated advantages and disadvantages of the proposed signal.
		Traffic Signal Warrants - Traffic signals are valuable devices for the control of vehicle and pedestrian traffic.
	www.ci.scottsdale.az.us /Traffic/SignsSignals (308 words)

	Traffic Signs and Signals (Site not responding. Last check: 2007-10-20)
		The Town of Gilbert's Traffic Engineering Department wants to ensure that when a traffic signal is installed at a specific location, traffic and pedestrian safety are improved.
		Traffic signals are a tremendous investment for the Town.
		A signal may increase the amount of traffic into and out of your neighborhood because a signal often can indicate that the street is a through street even though it may not be.
	www.ci.gilbert.az.us /traffic/signals.cfm (1388 words)

	Traffic Signals (Site not responding. Last check: 2007-10-20)
		traffic signal is any power-operated device by which traffic is warned or directed to take some specific action.
		While a properly placed traffic signal improves the flow and decreases serious injury crashes, an unnecessary one can be a source of danger and annoyance to all who use an intersection: pedestrians, cyclists and drivers.
		They are intended for use at intersections where traffic or physical conditions do not justify conventional traffic signals but where high crash rates or potential exists and indicate a special need.
	www.wcroads.org /POLICIES/RDCtrfcSgnl.htm (334 words)

	Pedestrian Signals
		Pedestrian signals are installed for two main reasons: a high volume of foot traffic at an intersection, or the signals directing motorists don't meet the needs of the pedestrians.
		If existing traffic signals meet the needs of people on foot, the signals are easy to see and provide plenty of time to cross safely so there is no need for pedestrian signals.
		Signals are times to allow plenty of time for people who are already in the crosswalk to get safely across the street.
	www.wsdot.wa.gov /biz/trafficoperations/traffic/pedsignals.htm (419 words)

	Dallas Transportation Management Systems - Traffic Signals FAQs
		If traffic signals are placed too close to each other along the arterial, progression cannot be provided for both directions.
		Traffic may need to be gated through this area, to make storage space for vehicles turning into the system from the side streets and prevent gridlock.
		The "lead-lag" left-turn sequence is used by engineers to provide green-to-green progression between signals and prevent the main street traffic from having to stop and wait for the opposing left-turn arrow to terminate.
	www.dallascityhall.com /html/traffic_signals_faqs.html (970 words)

	Traffic Signals (Site not responding. Last check: 2007-10-20)
		Traffic Signals are a vital tool used by the Washington State Department of Transportation to safely and efficiently manage vehicle, bicycle and pedestrian traffic on state highways.
		Traffic counts and accident statistics are the primary considerations for installing traffic signals.
		When they are installed, traffic signals provide a solution to specific operational challenges, such as stopping heavy flow of traffic on a major roadway to permit crossing movements from intersecting minor streets.
	www.wsdot.wa.gov /biz/trafficoperations/traffic/signals.htm (666 words)

	Subchapter II. Traffic Signs, Signals and Markings (Site not responding. Last check: 2007-10-20)
		Vehicular traffic, including vehicles turning right or left, shall yield the right-of-way to other vehicles and to pedestrians lawfully within the intersection or an adjacent crosswalk at the time such signal is exhibited.
		Vehicular traffic facing the yellow arrow signal shown alone or in combination with another indication is thereby warned that the previously displayed green arrow signal is being terminated.
		Vehicular traffic facing a green arrow signal, shown alone or in combination with another indication, may cautiously enter the intersection only to make the movement indicated by such arrow, or such other movement as is permitted by other indications shown at the same time.
	www.delcode.state.de.us /title21/c041/sc02/index.htm (1930 words)

	Traffic Signals - Streets and Traffic - City of Albuquerque
		New traffic signals are typically flashed before the normal sequence of signal operation is put into effect.
		Also, some traffic signals are flashed during parts of the day when there are lower traffic volumes.
		If the traffic signals are flashing during a time of day when they should have normal cycling operation and you are located in the City of Albuquerque, call Traffic Engineering (Dispatcher) at (505) 857-8028.
	www.cabq.gov /streets/signals.html (608 words)

	Detection of Bicycles at Demand-Actuated Traffic Signals
		Given the high frequencies at which signal detectors operate and the large conductive silhouette of the car, any effect the iron's properties might have to increase the inductance of the coil are overpowered by the induced electrical eddy currents in the vehicle which serve to reduce the inductance of the coil.
		But if the traffic signal technician turns up the sensitivity of the detector circuit to detect the small vehicle, it may also detect a large vehicle in an adjacent lane when the sensor's lane is empty.
		The author observed the signal operation to ensure it was working properly on demand, rather than on a timer, and approached the intersection repeatedly from the cross streets when no other traffic was coming, after the signal had been green for the arterial for more than 30 seconds.
	www.humantransport.org /bicycledriving/library/signals/detection.htm (3381 words)

	Traffic Signals, Signs & Street Lights
		After the vehicle has proceeded through the intersection, the signal will either remain green for that direction of travel until a vehicle from different direction triggers the detector or revert back to a "resting" phase, where the signal is green in the most traveled direction.
		Both modes of traffic signal operation are affected when a pedestrian pushes the pedestrian crossing button.
		Pushing the button overrides the signal functions and allows a dedicated amount of time for the pedestrian to cross the intersection based on the distance across the intersection.
	www.redwoodcity.org /publicworks/streets/traffic_control.htm (329 words)

	Traffic Signals \| Lighting and Driving \| Lighting Futures \| LRC
		A signal head (a single circular indication) consists of an incandescent filament lamp, surrounded by a reflector and fitted with a colored glass lens.
		In early signals, more than 600 individual LEDs might be mounted together in a disk formation to produce the circular indication, but these signals did not meet the requirements for distribution of luminous intensity.
		Although yellow LED signals also use the AlGaInP technology that red LEDs use, the much higher luminous intensity requirements for yellow traffic signals have made yellow LED signals technically impractical, and as of October 2000, no commercially available yellow LED signal can be purchased that meets ITE specifications.
	www.lrc.rpi.edu /programs/Futures/LF-Auto/trafficsignals.asp (915 words)

	3M Programable Visability Traffic Signals (Site not responding. Last check: 2007-10-20)
		These signals are unlike most common signals because in common signals, the light bulb is directly behind the colored lens and has a reflector directly behind the bulb.
		The signal this unit is mounted to is a Marbelite.
		I have masked the red indication of this signal so that if it were in use on a street, traffic directly in front of or to the right of this signal would get a clear red indication but traffic in a lane to the left of the signal would not get a clear indication.
	home.comcast.net /~jab8356/3m.htm (1067 words)

	City of Knoxville - Traffic Signals
		A traffic signal is installed as part of a roadway improvement project by TDOT or the City of Knoxville.
		Signal timing is based on a logic of providing as much time as possible to the major street, thus serving the larger motoring public interest.
		Signal phases are added as justified by engineering study, based upon traffic volumes of turning and opposing traffic.
	www.ci.knoxville.tn.us /engineering/traffic/signals.asp (605 words)

	Broward County - Traffic Engineering Division
		The Signal Construction and Maintenance Section is responsible for the installation and maintenance of traffic signals, and the maintenance of roadway lighting on selected roadways.
		Various types of traffic data are collected and analyzed in the performance of these studies and are available to the public.
		This data includes information relevant to traffic control devices such as timing for traffic signals, traffic signal maintenance records, and traffic sign and pavement marking installation and maintenance reports.
	www.broward.org /traffic/welcome.htm (660 words)

	Traffic Signals
		Traffic Signals are a part of everyone's life.
		In years past, a traffic signal was nothing more than a timer that controlled lights attached to a pole.
		Today, however, traffic signals are controlled by sophisticated computers that take into account all kinds of different variables in their operation.
	orserv01.ci.oak-ridge.tn.us /EL-html/newweb/traffic_signals.htm (106 words)

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