advisor / wen-chih, chang
award / 2010 taiwan international design competition: beneficence_winner
year / 2009
category / traficsign
material / plastic, rubber, metal, solar panel, rador sensor & led lights
size / 2100x800x250 (mm)
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concept
We often cannot see the traffic conditions clearly at crossroads, in alleys or the corners of hill roads. It is difficult to see cars that are coming across from us and those are passing horizontally. Although most of the roads have installed convex mirrors, people still cannot see the traffic conditions clearly because of blind spots and shades caused by other view. Therefore, I have designed Safe Convex, a detective device which can be installed on convex mirrors in order to avoid traffic accidents. Safe Convex has signals on both sides. When a car is coming from the left side, the light of the left will turn on; pedestrians will be notified that a car from left is reaching in short. Moreover, when cars are coming from both sides, both lights will be on and the mirror will spin in order to inform both drivers and pedestrians to slow down.
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problem & solution
In Taiwan, we have so many lanes in our city. Also, lots of cars shuttle at crossroads. It is really hard for us to see the car come across from the other alley. Our government was already set up a convex at the corner of the intersection. But, there are too many objects that reflected from that mirror. Also the sight of drivers may influence by rain, fog and inadequate light. In this case, drivers can't see the real situation clearly. An accident may occur. In order to solve this problem, I use radar to sense the cars from the both side. The radar senses the frequency between cars' move and distance. When cars coming, Safe Convex will response and show the signature to indicate drivers.
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demonstration
A sensor is attached on the safe convex mirror; it sensors engines in cars, so two cars are getting close together, the red light for will turn on for the purpose of informing.
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technology
Solar Power: Solar power is the conversion of sunlight into electricity, either directly using photovoltaics (PV), or indirectly using concentrated solar power (CSP). Concentrated solar power systems use lenses or mirrors and tracking systems to focus a large area of sunlight into a small beam. Photovoltaics convert light into electric current using the photoelectric effect.
LED Light: A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices and are increasingly used for other lighting. Introduced as a practical electronic component in 1962, early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet, and infrared wavelengths, with very high brightness.
Radar: The Doppler effect is used in some types of radar, to measure the velocity of detected objects. A radar beam is fired at a moving target — e.g. a motor car, as police use radar to detect speeding motorists — as it approaches or recedes from the radar source. Each successive radar wave has to travel farther to reach the car, before being reflected and re-detected near the source. As each wave has to move farther, the gap between each wave increases, increasing the wavelength. In some situations, the radar beam is fired at the moving car as it approaches, in which case each successive wave travels a lesser distance, decreasing the wavelength. In either situation, calculations from the Doppler effect accurately determine the car's velocity. Moreover, the proximity fuse, developed during World War II, relies upon Doppler radar to explode at the correct time, height, distance, etc.
It can sense cars frequency by different speed and distance.
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