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Topic: Signal timing

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	Institute of Transportation Engineers -- ITE
		Signal timing is the process of optimizing the operations of signalized intersections.
		The objective of signal timing is to respond to the demands of all types of motor vehicles, bicycles and pedestrians in an optimal manner.
		Signal timing is only effective as long as the traffic patterns that were used to generate the signal timing remain reasonably similar.
	www.ite.org /signal/index.asp (358 words)

	HVCEO Transportation Planning - Traffic Signal Coordination Handbook
		A signal phase is a group of three intervals (the right-of-way (green), change (yellow), and clearance (red)) that are assigned to an independent traffic movement or combination of movements.
		In an actuated signal control, the signal is designed to adjust its timing within specified limits to respond to traffic conditions at the moment, as registered with the controller via traffic detectors located in the street.
		Signal coordination is perceived by many agencies as an advantageous improvement to the community or corridor in consideration.
	www.hvceo.org /transport/signal_coordination.php (3338 words)

	Encyclopedia: Global Positioning System
		The accuracy of the GPS signal itself is about 5 meters (16 ft) as of 2005 and has steadily improved over the last 15 years.
		Many synchronization systems use GPS as a source of accurate time, hence one of the most common applications of this use is that of GPS as a reference clock for time code generators or NTP clocks.
		The outdoor positioning system is based on signals and satellites which give the longitude and latitude to within a metre; the computer converts this data to a position on an electronic map of locality.
	www.nationmaster.com /encyclopedia/Global-Positioning-System (699 words)

	FHWA Operations - Traffic Signal Timing - Toolbox
		Traffic Signal Timing Blended Course (CITE - Consortium for ITS Training and Education) - The course provides students with an understanding of both the theory and practice of traffic signal timing and its impact on traffic operations.
		Traffic Signal Timing and Coordination Course (MN/DOT) - This three-day Signal Timing and Coordination Course is designed to enable the participants to obtain an understanding of fundamental concepts and Mn/DOT standard practices related to traffic signal timing and coordination of signalized intersections along an arterial network.
		Signal Timing Practices and Procedures-State of the Practice - This ITE report documents the current state-of-the-practice in traffic signal timing.
	ops.fhwa.dot.gov /traffic_sig_timing/toolbox.htm (2071 words)

	[No title] (Site not responding. Last check: 2007-10-07)
		The expression "Timing is everything" is commonly associated with new business ventures, movie releases, advertising campaigns and marriage proposals, but nowhere is this statement more passionately embraced than in the world of traffic signal operation.
		Signal timing patterns were evaluated to determine the most efficient intersection groupings and respective cycle lengths.
		Time savings during PM drive times were not as dramatic due to more intersections operating at maximum capacity throughout the PM peak period.
	www.chandleraz.org /default.aspx?pageID=58 (535 words)

	Basic Signal Timing Elements (Site not responding. Last check: 2007-10-07)
		Signalized intersections permit conflicting traffic movements to proceed efficiently and safely through space that is common to those movements.
		The basic timing elements within each phase include the green interval, the effective green time, the yellow or amber interval, the all-red interval, the intergreen interval, the pedestrian WALK interval, and the pedestrian crossing interval.
		Finally, the pedestrian crossing time is the time required for a pedestrian to cross the intersection.
	www.webs1.uidaho.edu /niatt_labmanual/Chapters/signaltimingdesign/theoryandconcepts/BasicSignalTimingElements.htm (435 words)

	[No title]
		When this signal is "On" and the Request To Send,Data Set Ready, and Data Terminal Ready are all "On", the DTE is assured that its data will be sent to the communications link.
		This signal is active when the secondary communication channel is receiving a good analog carrier (same function as the Receive Line Signal Detect signal).
		This signal is equivalent to the Transmitted Data line except that it is used to transmit data on the secondary channel.
	www2.rad.com /networks/1995/rs232/pins.htm (1836 words)

	Comparison circuit for comparing semiconductor device output by strobe signal timing - Patent 5659553
		Further, since the timings of the strobe signals vary depending on the timing data from the memory 31, phases of the strobe signals STBH and STBL are usually different from those of the system clock.
		The output signal SL from the level comparator 6 is latched by a buffer 46 at the timing of the strobe signal STBL and stored in a flip-flop 47 at the timing of the strobe signal through a delay element 49.
		In such a situation, the selector is switched from the strobe open signals from the decoder 301 provided at a terminal 1 to the strobe open signals from the memory 302 provided at a terminal 2 by a mode signal 305 given at a terminal S of the selector 303.
	www.freepatentsonline.com /5659553.html (4251 words)

	[No title]
		When Timing and Sync Signal A is high then the A half of the 29525's is selected for writing into, and when the Timing and Sync Signal A is low than the B half of the 29525's is selected for writing data into.
		Timing & Sync Signal C is used to select which section of the AM29525 is read.
		Timing & Sync Signal H is used as the ADC Convert Clock Signal.
	www.pa.msu.edu /hep/d0/ftp/l1/cal_trig/timing/cal_trig_timing.txt (2427 words)

	City of Houston -- Public Works and Engineering -- Traffic and Transportation Division -- Traffic Signal Timing ... (Site not responding. Last check: 2007-10-07)
		The central approach of TSTOP was to provide an optimized level of traffic signal operation on the city's most heavily traveled corridors and throughout some of its most heavily populated employment areas.
		Of this number, 99 traffic signals on 5 critical corridors connecting the Downtown/Midtown/TMC gateway to the Uptown area were optimized in conjunction with the Department's plan to mitigate the effects of the Spur 527 closure.
		Through TSTOP 2005, timing on 444 traffic signals on 52 corridors part of the Southwest, West Central, North Central, North West, North East, South East, Clear Lake, Kingwood and South Houston Zones were optimized, integrating adjacent intersections in order to establish a network operation model.
	www.publicworks.cityofhouston.gov /traffic/optimization.htm (461 words)

	Jan/Feb 2002 Public Roads - Managing Traffic Flow Through Signal Timing
		A new signal system and improved signal timing in Abilene, Texas, produced a 13-percent reduction in travel time, a 37-percent reduction in delay, and a 6-percent savings in fuel use.
		For example, the pretimed controller for the signal at one intersection might be set to give the primary street 40 seconds of green time, and the secondary street might be assigned 15 seconds of green.
		We've gone as far as adaptive signal control, where the traffic volume is read on a second-by-second basis and the signal timing is automatically adjusted.
	www.tfhrc.gov /pubrds/janfeb02/timing.htm (1978 words)

	When the Timing is Right (Site not responding. Last check: 2007-10-07)
		The time required to implement, update and maintain makes it more difficult for large systems unless sufficient manpower is allocated to the signal system.
		Signal coordination is typically the most beneficial component of an ATMS because the coordination provides benefits for the entire day, every day of the year.
		With the signal system providing 87% of the benefits to the Salt Lake Valley ATMS, it’s clear that this aspect of ATMS provides the biggest return on investment and in one year justifies the installation costs for the communication system.
	www.itsworld.com /tme/index.cfm/powergrid/rfah=\|cfap=/CFID/1941399/CFTOKEN/91265906/fuseaction/showArticle/articleID/5716 (1447 words)

	The RS232 Standard
		This signal is relevant when the DCE device is a modem, and is asserted (logic '0', positive voltage) when a ringing signal is being received from the telephone line.
		Timing signals are provided by the DTE device for use by a modem.
		Signal State Voltage Assignments - Voltages of -3v to -25v with respect to signal ground (pin 7) are considered logic '1' (the marking condition), whereas voltages of +3v to +25v are considered logic '0' (the spacing condition).
	www.camiresearch.com /Data_Com_Basics/RS232_standard.html (5380 words)

	Broward County - Traffic Engineering Division
		The cycle length is the time that elapses for the signal to service all the signal phases between the beginning of green for the main street to the return of the beginning of green for the main street; that is, a complete sequence of signal indications.
		This time, expressed in seconds, is dependent upon the traffic volume to be serviced at any given intersection (main street and side streets) and therefore varies by the time of day.
		The study of the the timing for arterials in Broward County is an ongoing process.
	www.co.broward.fl.us /traffic/tei01503.htm (743 words)

	Adjusting Signal Timing (Part 2) - Crosstalk effects in serpentine traces
		When a signal passes through a serpentine trace with coupling between the legs, there is an apparent speed-up of the signal.
		The amount of apparent speed-up is directly related to the coupling strength between the legs and inversely related to the rise time of the signal passing through the section.
		For long coupled lengths (those longer than the critical length) signals may become distorted as they pass through the serpentine section, but the degree of distortion is a complex function of the frequency of the signal.
	www.mentor.com /products/pcb/pads/techpubs/mentorpaper_19324.cfm (192 words)

	PEDSAFE : countermeasures (Site not responding. Last check: 2007-10-07)
		In addition to concurrent pedestrian signal timing (where motorists may turn left or right across pedestrians’; paths after yielding to pedestrians), exclusive pedestrian intervals (see Traffic Signal Enhancements) stop traffic in all directions.
		This is not very pedestrian-friendly, and many pedestrians will simply choose to ignore the signal and cross if and when there is a gap in traffic, negating the potential safety benefits of the exclusive signal.
		Adjusting signal timing is very low cost and requires a few hours of staff time to accomplish.
	www.walkinginfo.org /pedsafe/pedsafe_curb1.cfm?CM_NUM=39 (617 words)

	Traffic Signal Timing
		Traffic Signal Timing provides an understanding of both the theory and practice of traffic signal timing.
		This course is for new and experienced engineering personnel involved in analysis of signalized intersections, arterial street systems, and signal timing operations.
		While much of the course is focused on signal timing theory and practice, material will be introduced that challenges the state of the practice to move toward best practice that is currently being discussed among FHWA, ITE and TRB.
	www.engr.washington.edu /epp/Transpeed/tso.html (324 words)

	- Topic Pages
		The goal of traffic signal coordination is to progress the greatest number of vehicles through the system with the fewest stops and shortest amount of delay in a comfortable manner.
		The Traffic Signal Timing Team is made up of the City's Traffic Engineer and technicians who specialize in the timing and coordination of the traffic signals.
		This may require that the timing of the intersections be adjusted to facilitate the best flow of vehicles.
	www.springsgov.com /Page.asp?NavID=2482 (629 words)

	FHWA Operations - Traffic Signal Timing - About the Program
		The Signal Timing Program was formulated by FHWA to provide leadership in mainstreaming traffic signal timing/retiming and coordination as a fundamental and continuing part of any transportation improvement plan.
		Traffic Signal Training Assessment – The purpose of this work is to better understand the training needs for practitioners in the area of traffic signal timing and operations.
		A signal timing initiative, no matter how successful in advancing the state-of-the-art, is ultimately of limited benefit if it does not meet the needs of its stakeholders.
	ops.fhwa.dot.gov /traffic_sig_timing/tst_progplan.htm (930 words)

	PS/2 keyboard and mouse protocols adn signal timing
		The states of "1" and "0" are defined when the Differential 1 and Differential 0 are driven onto the signals during the idle periods between packet transmissions.
		Figures A and B show that the polarity of the D+ and D- signals during the packet transmission is opposite between high and low speed links.
		The D+ and D- signals are also used to define whether a device is connected to a link and the speed of that link.
	www.networktechinc.com /usb-prots.html (381 words)

	FHWA Operations - Traffic Signal Timing
		It is further estimated that poor traffic signal timing accounts for 5-10% of all traffic delay or 295.8 million vehicle-hours of delay on major roadways alone.
		Traffic signal retiming is one of the most cost effective ways to help traffic move and is one of the most basic strategies to help mitigate congestion.
		There are tools and resources available to create an awareness of the benefits of improved signal timing and to improve the knowledge base through education, training and guidance or technical assistance.
	www.ops.fhwa.dot.gov /traffic_sig_timing/index.htm (306 words)

	FHWA Operations - Traffic Signal Timing - National Report Card
		The goal is to generate national press attention to the state of signal timing in the US.
		A few model locations may be called out for their outstanding practices in signal timing.
		Press packets will be provided and designed for tailoring to reflect local traffic signal situations and "grades" (if local agencies choose to release their grade to their local press).
	www.ops.fhwa.dot.gov /traffic_sig_timing/report_card.htm (451 words)

	NYCDOT - Frequently Asked Questions (FAQs) Traffic Signal Information (Site not responding. Last check: 2007-10-07)
		The timing for each signal is determined based on traffic volume and traffic patterns in each particular area.
		If we decide that a traffic signal would not be appropriate at a particular location, we may select another option to control traffic, such as speed humps, speed limit signs, stepped-up traffic enforcement, and Safety City programs.
		A: As of January 2006, there were 11,871 signalized intersections citywide, including 2,795 in Manhattan, 4,100 in Brooklyn, 2,942 in Queens, 1,536 in the Bronx, and 500 in Staten Island.
	www.nyc.gov /html/dot/html/about/faqs_signals.html (759 words)

	News - CITE Releases Traffic Signal Timing Course (Site not responding. Last check: 2007-10-07)
		This course gives students an overview of the terms associated with signal timing; discusses the concepts of cycle length, split, offset, midblock friction, phase sequences, the signal timing process, and signal timing optimization; and looks at the types of actuated controllers, passage time, extension, and the coordination of actuated and pretimed controllers.
		It also discusses the development of timing plans, explores types of signal control (first generation control and advanced techniques, including Rhodes, RT-TRACS, SCAT, and SCOOT) and investigates the relationship of signal timing to ITS: regional and system/design considerations.
		A modified version of this course, called Signal Timing Concepts, is available for signal technicians, traffic engineers, signal system engineers and planners interested in obtaining a basic understanding of the principals of signal timing.
	www.itsa.org /ITSNEWS.NSF/4e0650bef6193b3e852562350056a3a7/0e8f757c67fa6ca885256d5d006d6527 (422 words)

	Existing Signal Timing - Case Study 1
		Once the analysis software is running, we will be able to qualitatively compare the signal timing plan with the original one.
		Signal Timing Plan includes the phasing plan, cycle length, and green splits.
		In order to input the timing plan into the controller, you must assign NEMA phase numbers to the phases (convert Phase A to NEMA Phase #, and so on).
	www.webs1.uidaho.edu /niattproject/Cases/casestudy01/improved.htm (493 words)

	[No title]
		This project focused on the traffic flowing modeling, simulation, and signal timing plans evaluation of the Miller Hill corridor on Highway 194 (Central Entrance - Miller Trunk Highway) between Arlington Avenue and Haines Road (Duluth-Hermantown city limit).
		The main goal of this research is to study the traffic flow on the corridor and develop a better signal timing plan to improve the efficiency of the traffic movement in that area.
		For instance, from this study it is possible to develop an areawide adaptive traffic signal control system to continuously monitor current traffic flow conditions and provide optimal allocation of green-yellow-red signal duration time to different traffic streams in order to minimize the queues at the intersections along the roadway considered.
	www.d.umn.edu /ece/MnDot (649 words)

	vertical interval time code - a Whatis.com definition - see also: VITC (Site not responding. Last check: 2007-10-07)
		Vertical interval time code (abbreviated VITC and sometimes pronounced VIHT-see) is a timing signal that is part of a video recording.
		VITC is one of two timing schemes adopted by the Society of Motion Picture and Television Engineers (SMPTE) in the 1960s.
		The time code can be used to start a recording at a certain chronological time (such as 5:00:00 p.m.), or it can be used to keep a playback machine synchronized with a master time source.
	whatis.techtarget.com /definition/0,,sid9_gci865178,00.html (233 words)

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