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Vehicular communication systems are computer networks in which vehicles and roadside units are the communicating nodes, providing each other with information, such as safety warnings and traffic information. They can be effective in avoiding accidents and traffic congestion. Both types of nodes are dedicated short-range communications (DSRC
Leading lights, also known as range lights in the United States, are a pair of light beacons used in navigation [2] to indicate a safe passage for vessels entering a shallow or dangerous channel; they may also be used for position fixing. At night, the lights are a form of leading line that can be used for safe navigation. The beacons consist ...
Reliability is a high priority in range safety systems, with extensive emphasis on redundancy and pre-launch testing. Range safety transmitters operate continuously at very high power levels to ensure a substantial link margin. The signal levels seen by the range safety receivers are checked before launch and monitored throughout flight to ...
Hand signals are also sometimes used when regular vehicle lights are malfunctioning or for older vehicles without turn signals. A trafficator deploys from a vehicle's side to indicate a turn in that direction. Some cars from about 1900 to through 1966 used retractable semaphores called trafficators rather than flashing lights. They were ...
Cars have controls for headlamps, fog lamps, turn signals, and other automotive lighting. Turn signals are activated by the driver to alert other drivers of their intent to turn or change lanes. [12] While the modern turn signal was patented in 1938, [13] electric turn-signal lights date back to 1907. [14]
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The system is active up to 31 miles per hour (50 km/h) and steers, brakes, and accelerates the car on its own. [77] It relies on the adaptive cruise control sensing a car in front and clear lane markings to be present. 2016 Audi: Audi A4: Semi-autonomous traffic assistant marketed as "Traffic Jam Assist" offered as an option. Tesla: Model S ...
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