Transcript: traffic light the traffic light was invented in 1923 the inventor of the traffic light was William l. Potts the first traffic light was made in Detroit the first traffic light was a gas lamp. traffic light are also known as stoplights, traffic lamps, traffic signals, signal lights, robots or semaphores Illumination of the green light allows traffic to proceed in the direction denoted, if it is safe to do so Illumination of the orange/amber light denoting prepare to stop short of the intersection , if it is safe to do so Illumination of the red signal prohibits any traffic from proceeding i think they will be all futuristic when i get a car it affects people because without them there would be tons of wrecks
Transcript: He made them with green, amber, and red lights; along with wire. Invention of 1920 William Potts Within a year Detroit had a total of 15 automatic traffic lights through out the city. One of the main safety precautions helping reduce the number of crashes around our nation. The traffic light now is truly a major part of making driving safe for drivers and pedestrians. They regulate traffic making it safer and faster while moving through intersections. By: Kaddie Levine The Invention of the Traffic Light Potts first got the idea for traffic lights from railroads. They already had automatic controls. He noticed the only huge difference of travel between the railroads and automobile roads was the direction. Railroads moved parallel and street traffic moved with right angles. The first traffic light was invented in 1920 by a police officer from Detroit Michigan, William Potts. LIGHTS.LIGHTS.LIGHTS.LIGHTS.LIGHTS.LIGHTS.LIGHTS.LIGHTS. Importance to Society The lights were first installed in the Woodward Region and Michigan Avenues in Detroit. Installation
Transcript: Prevent Theft To All Subsystems Light Sensor To All Subsystems Manages Emergency Vehicle Alarm Interface Isolates Internal Control Remote Alarm System Suppy Regular Power Traffic Light Project Team: RFV Dust Remover Light Bulb Installs Water Remover Weather Interface Exchanges Heat Light Bulbs Exchanges Power Interface Ventilation and Temperature Subsystem Dust Interface Manages Dust Retainer Removes Water Interface Traffic Light System Maintenance Interface Light Bulb Inspects Maintenance Access Manages Light Avoid Thunder Effect Light Exchanges Heat Malfunction Alarm Isolates Management Interface Suppy Emergency Power Water Retainer To All Subsystems Heater Removes Power Subsystem Manages
Transcript: The Traffic Light by:Danny Maday The traffic light was invented by William L. Potts, a police officer who wanted to keep traffic flowing. The first traffic light was installed in 1868 in London. The first traffic light was for the flow of pedestrians, buggies, and wagons. The car was not invented yet. This is William Potts. This is Potts' invention. The traffic light. The first traffic light exploded on January 2, 1869. Potts needed to improve the traffic light, so he got red, green, and amber railroad lights, and electrical wire. This created the first four way traffic light. It was installed in 1920 in Detroit. Later, Garrett Morgan improved the traffic light even more and made it electric. Life without the traffic light. Works Cited http://www.youtube.com/watch?v=6X0XaIeR2Ks&feature=related http://ideafinder.com/history/inventions/trafficlight.htm
Transcript: There is crossroad and there are lot of traffic. We need an object that controls this. PUT A TRAFFIC LIGHT ASK FOR SOMEONE THAT CONTROLS THE TRFFIC PUT A SIGN STOP - Two lights bulbs - A battery - A switch (witch a pin and a clip) -A 2 way switch (witch two pins and a clip) - A green paper and red paper A piece of wood or a cardboard that measure 20 x 20 - An empty pen 1, 5 m. of cable - A small box where will put the light bulbs We have 3 euros to buy 2 light bulbs, 1,5 metres of cable and a battery CONSTRUCTION 1 we munt the electric circuit which the material 2. Second put the two light bulbs in holes of small box 3 pass the cables into the empty pen 4 put a green paper and a red paper front of the lights bulbs 5- We glue the empty pen with the cables at the piece of wood or cardboard and then we glue the small box with the light bulbs on the pen. Also we glue the battery on the wood. 6. Put a 2 way switch made witch a clip and witch 2 pins, connects witch the light bulbs 7. We connect the light bulbs and the battery 8 Connect the battery witch a switch and a clip and pin 9 Connect the switch witch the 2 way switch 10 Once you've done all these steps will have a traffic light BUDGETS THE PROBLEM OR NEED TRAFFIC LIGHT CHOOSE THE BEST SOLUTION MATERIAL LIST SEVERALS SOLUTIONS
Transcript: The pedestrian cross-light were also invented. These were located on busy streets & intersections.Designed to keep pedestrians in one spot when they needed to cross the road that way all drivers knew where to watch. Traffic Lights began to be used more consistently. Hanging from wires,put on poles street corners On December 10, 1868 The first traffic light were installed outside the british parliament building by railroad engineer by J.P Knight November 23 .... Used to tell oncoming traffic which direction is allowed.Also used for lane openings. Early Trials Who invented the 1st traffic lights List of precautions to follow in the event of a traffic light being out. Garrett Morgan patented the new version of the traffic light. It consisted of a T-shaped pole & could be operated from a distance. It was designed to be mounted on a street corner and notify drivers weather they should stop or go.In 1923 the patented was purchased by General Electric. March 20 1920 https://www.timetoast.com/timelines/116221 MiKaela Johnson Direction Lights William Potts decide to use colors like red, yellow and green. This helped with controlling traffic lights from four directions. Within a year Potts had installed twelve lights around the city. Traffic Lights Pictures Bibliography Traffic Light 1868 Precaution List Pedestrian Crossing After a month the lamp exploded and an officer was injured. Inventors began trying to make improvements on the traffic light but most failed. A police man from Detroit , Michigan William L Potts decide to create a new traffic light based on railroad signals.
Transcript: Ergonomics is about designing for people wherever they interact with producets, systems or processes. It becomes necessary to understand and design for the variability represented in the population. cultural difference THANKS YOU FOR YOUR ATTENTION !! second , the design of traffic light in ShangHai does not take enough consideration for the visually disabled and the hearing impaired. AND FINALLY SHANGHAI Color wavelength For driver High light： LED Light Color： Red & Green Light Control： Auto According to Environment History of Traffic Lights 2. Automated Enforcement of traffic lights -13 August 2001 Robert P. Maccubbin. Chiou Yu Chung d0251392 comparatiopn Reference Because the red wavelength is the longest. So, we can see it in a long distance that you will have enough time to stop your car on the other to stop your car. On the other hand, the yellow is the second longest. Last, the maximum contrast with red is green color. So, people will use green orange as a go signal, you will be difficult to resolve. HONGKONG TAIWAN 1.ㄍㄍeducation 2 bicycle 3 more consideratione for blind people 1.台湾交通灯三年内全部改用LED、2007-07-05、http://news.mydrivers.com/1/86/86620.htm Tsoi Yuk Sing 13063524d Tes Ching Ying 13058116 New Design !!!! Traffic lights in every different places will always be different for their people by defferent culture and human habits and the transportations they ues in life , so maybe we can not be accustomed to shanghai 's traffic lights and always have a lot of complain for it but actually it is shanghai people 's life , shanghai people's memory . In the wake of car appearing, people and car need to walk in same road, the result of this may make people and car walking together, that will cause accident. So, we need to invent a signal to decide what time people walk and stop. In 1868, UK mechanical engineer Hartford design a cylinder that will display red and green color in order to separate people and car walk in same road. However red and green are not enough because the driver have no time to reduce the velocity that will cause accident easily if it from red changes to green. , the result of this may make people and car walking together,that will cause accident .So, we need to invent a signal to decide what time people walk and stop. Automated Enforcement of Traffic Signals: A Literature Review ---13 August 2001 Robert P. Maccubbin In 1868, UK mechanical engineer Hartford design a cylinder that will display red and green color in order to separate people and car walk in same road. However red and green are not enough because the driver have no time to reduce the velocity that will cause accident easily if it from red changes to green. In 1918, Chinese scientist 胡汝鼎 design another color light as a buffer time. The color is yellow, which is 3 second. Now, it is not just for driver and people still have bicyclers. For people, the high of traffic lights is 2.5 meter and it has different voice to decide people go or stop. For driver the high is 5 meter. Traffic Lights in Shanghai For pedestrian What is Ergonomics Who are we ?? liudi 1350062 Summary The first issue is there are many types of traffic light no matter for people of pedestrian, biker and driver. In the wake of car appearing, people and car need to walk in same road Comparison in Different Cultures TRAFFIC LIGHT -Hongkong , Taiwan, Shanghai The currently existing problems of traffic light SAME POINTS
Transcript: School of Engineering 3 13 AND Gate (74LS08, 74LS11, 74LS21) OR Gate (74LS32, 4075BD) XOR Gate (74LS86) NOT Gate (74LS04) D-Flip flop (74LS175) Push button Voltage Source Counter BCD(74LS190, 74LS191, 74LS192) Traffic light Ground 6 16 Prof. Idalides Vergara Laurens, Ph.D. 12 State Diagram Flip-flop Selection Excitation Table Questions Transition Table 2 Counter: Synchronous PB/DOWN BCD (Binary to Decimal Counter). Counts pulses and displays them in decimal form. Selected Counter The yellow light must last 10 seconds. The green light of each solo must last 30 seconds. The green light on the second avenue must last 45 seconds. The green light on the primary avenue must last 60 seconds. When the yellow light finish his period, all the traffic lights must be red for 2 seconds. You must include a counter cars. When the traffic light is green, the counter it has to activate. If reach his minimum count for each case, the time has to be reset. State/Output Table for Counters Principal avenue 20 cars. Secondary avenue 20 cars Solos 10 cars Counters Equations 1 10 Number of states minimize: States Variables Julio David Cruz - S00836086 Luis A. Jimenez Gonzales - S00489630 8 11 AR = All light red APV = Principal avenue light green APA = Principal avenue light yellow SAPV = Solo principal avenue SAPA = Solo principal avenue yellow ASV = Secondary avenue green ASA = Secondary avenue yellow ASSV = Secondary avenue solo green ASSA = Secondary avenue yellow 4 Problem Statement ELEN 312 – Digital Logic Design Flip-flop: D-Flip flop (74LS175N) Traffic Light 14 R = Red / A = Yellow / V = Green Materials 7 Conclusions 9 State/Output Table Excitation Equations 5 Every day we have to handle simple things, and we are not always aware that there are behind them, how they work. Things that have simple sight seem simple, may have more complicity inside. This project opens the door in detail to the world of computerized systems. The projects are big or small, always the research of the same provides better resources Constraints Output Equations 15 Design a traffic light to control an intersection of two avenues and the solos of each one. Output Function Table
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