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In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a separate signal called the modulation signal that typically contains information to be transmitted. For example, the modulation signal might be an audio signal representing sound from a microphone, a video signal representing moving images from a video camera, or a digital signal representing a sequence of binary digits, a bitstream from a computer.
Traffic comprises pedestrians, vehicles, ridden or herded animals, trains, and other conveyances that use public ways (roads/sidewalks) for travel and transportation.
An intelligent transportation system (ITS) is an advanced application which aims to provide innovative services relating to different modes of transport and traffic management and enable users to be better informed and make safer, more coordinated, and 'smarter' use of transport networks.
Traffic lights, traffic signals, or stoplights – also known as robots in South Africa and Namibia – are signaling devices positioned at road intersections, pedestrian crossings, and other locations in order to control the flow of traffic.
Traffic engineering is a branch of civil engineering that uses engineering techniques to achieve the safe and efficient movement of people and goods on roadways. It focuses mainly on research for safe and efficient traffic flow, such as road geometry, sidewalks and crosswalks, cycling infrastructure, traffic signs, road surface markings and traffic lights. Traffic engineering deals with the functional part of transportation system, except the infrastructures provided.
A puffin crossing is a type of pedestrian crossing in use in the United Kingdom.
A school bus is any type of bus owned, leased, contracted to, or operated by a school or school district. It is regularly used to transport students to and from school or school-related activities, but not including a charter bus or transit bus. Various configurations of school buses are used worldwide; the most iconic examples are the yellow school buses of the United States which are also found in other parts of the world.
Buses have been used as a mode of public transport in London since 1829, when George Shillibeer started operating a horse-drawn omnibus service from Paddington to the City of London. In the decades since their introduction, the red London bus has become a symbol of the city.
Shared space is an urban design approach that minimises the segregation between modes of road user. This is done by removing features such as curbs, road surface markings, traffic signs, and traffic lights. Hans Monderman and others have suggested that, by creating a greater sense of uncertainty and making it unclear who has priority, drivers will reduce their speed, in turn reducing the dominance of vehicles, reducing road casualty rates, and improving safety for other road users.
Traffic signal preemption is a system that allows an operator to override the normal operation of traffic lights. The most common use of these systems manipulates traffic signals in the path of an emergency vehicle, halting conflicting traffic and allowing the emergency vehicle right-of-way, thereby reducing response times and enhancing traffic safety. Signal preemption can also be used on tram, light-rail and bus rapid transit systems, to allow public transportation priority access through intersections, and by railroad systems at crossings to prevent collisions.
The Sydney Coordinated Adaptive Traffic System, abbreviated SCATS, is an intelligent transportation system that manages the dynamic timing of signal phases at traffic signals, meaning that it tries to find the best phasing for a traffic situation. SCATS is based on the automatic plan selection from a library in response to the data derived from loop detectors or other road traffic sensors.
Bus priority or transit signal priority (TSP) is a name for various techniques to improve service and reduce delay for mass transit vehicles at intersections controlled by traffic signals. TSP techniques are most commonly associated with buses, but can also be used along tram/streetcar or light rail lines, especially those that mix with or conflict with general vehicular traffic.
A queue jump is a type of roadway geometry used to provide preference to buses at intersections, often found in bus rapid transit systems. It consists of an additional travel lane on the approach to a signalised intersection. This lane is often restricted to transit vehicles only. A queue jump lane is usually accompanied by a signal which provides a phase specifically for vehicles within the queue jump. Vehicles in the queue jump lane get a "head-start" over other queued vehicles and can therefore merge into the regular travel lanes immediately beyond the signal. The intent of the lane is to allow the higher-capacity vehicles to cut to the front of the queue, reducing the delay caused by the signal and improving the operational efficiency of the transit system.
Intelligent speed assistance (ISA), or intelligent speed adaptation, also known as alerting, and intelligent authority, is any system that ensures that vehicle speed does not exceed a safe or legally enforced speed. In case of potential speeding, the driver can be alerted or the speed reduced automatically.
The normal function of traffic lights requires more than sight control and coordination to ensure that traffic and pedestrians move as smoothly, and safely as possible. A variety of different control systems are used to accomplish this, ranging from simple clockwork mechanisms to sophisticated computerized control and coordination systems that self-adjust to minimize delay to people using the junction.
iBus is an Automatic Vehicle Location (AVL) system to improve London Buses using technology installed by Siemens. The system tracks all London's buses, providing passengers with audio-visual announcements and improved information on bus arrivals, as well as triggering bus priority at traffic lights.
Cycling infrastructure is all infrastructure cyclists are allowed to use. Bikeways include bike paths, bike lanes, cycle tracks, rail trails and, where permitted, sidewalks. Roads used by motorists are also cycling infrastructure, except where cyclists are barred such as many freeways/motorways. It includes amenities such as bike racks for parking, shelters, service centers and specialized traffic signs and signals. The more cycling infrastructure, the more people get about by bicycle.
Smart traffic lights or Intelligent traffic lights are a vehicle traffic control system that combines traditional traffic lights with an array of sensors and artificial intelligence to intelligently route vehicle and pedestrian traffic. They can form part of a bigger intelligent transport system.
The Toyota Sora is a transit bus with an electric motor powered by hydrogen fuel cells produced by Toyota, developed in cooperation with Hino Motors. The bus uses components originally developed for the Toyota Mirai, a mid-size fuel cell sedan. The name Sora is an abbreviation of the words Sky, Ocean, River and Air and refers to the water cycle.
Baher Abdulhai is a Canadian civil engineer, academic, entrepreneur, and researcher. He is a Professor in the Department of Civil Engineering, Director of Intelligent Transportation Systems Centre, and Co-Director of iCity Centre for Automated and Transformative Transportation at the University of Toronto. He is also the CEO and managing director of IntelliCAN Transportation System Inc.
References
- ↑ Housnell, N. B.; Shrestha, B. P.; Head, J. R.; Palmer, S.; Bowen, T. (2008). "The way ahead for London's bus priority at traffic signals" (PDF). IET Intelligent Transport Systems . 2 (3). Institution of Engineering and Technology. doi:10.1049/iet-its:20070060. Archived from the original (PDF) on 17 November 2009. Retrieved 28 April 2010.
- 1 2 "Bus priority at traffic signals keeps London's buses moving Selective Vehicle Detection (SVD)" (PDF). Transport for London. January 2006. Retrieved 10 May 2024.
- 1 2 3 Housnell, N. B.; Shrestha, B. P.; Head, J. R.; Palmer, S.; Bowen, T. (2008). "The way ahead for London's bus priority at traffic signals" (PDF). IET Intelligent Transport Systems . 2 (3). Institution of Engineering and Technology. doi:10.1049/iet-its:20070060. Archived from the original (PDF) on 17 November 2009. Retrieved 28 April 2010.
- 1 2 Matt Stephens (19 October 2011). "TfL wheels out digital bus info upgrade". The Register.
- ↑ "All London's buses now fitted with iBus". Transport for London. 23 April 2009. Retrieved 10 May 2024.
