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。 開車用手機(jī)發(fā)消息是車禍致死的主要原因/智能方向盤Texting while driving was listed as a major cause of road deaths among young Americans back in 2013. A recent study said that 40% of American teens claim to have been in a car when the driver used a cellphone in the way that put people in danger. It sounds like a widespread disease, but it’s one that technology may now help to cure. TJ Evarts, a 20yearold inventor, has e up with a novel solution that could easily put texting drivers on notice. It’s called ‘Smart Wheel’. And it’s a design to fit over the steering wheel of most standard vehicles to track whether or not the driver has two hands on the wheel at all times. Evarts’ invention warns the drivers with a light and a sound when they hold the wheel with one hand only. But as soon as they place another hand back on the wheel, the light turns back to green and the sound stops. It also watches for what’s called ‘closeby hands’, where both hands are close together near the top of the wheel, so the driver can type with both thumbs and drive at the same time. All the data Smart Wheel collects is also sent to a connected app. So any parent who installs Smart Wheel can keep track of the teens’ driving habits. If they try to remove or damage the cover that’s reported as well.美國高速公路系統(tǒng)The United States has one of the best highway systems in the world. Interstate highways connect just about every large and midsized city in the country. Did you ever wonder why such a plete system of excellent roads exists? For an answer, you would have to go back to the early 1920s. In those years, just after World War I, the military wanted to build an American highway system for national defense. Such a system could, if necessary, move troops quickly from one area to another. It could also get people out of cities and danger of being bombed. Socalled roads of national importance were designated, but they were mostly small country roads. In 1944, Congress passed a bill to upgrade the system but did not fund the plan right away. In the 1950s, the plan began to bee a reality. Over 25 billion dollars was appropriated by Congress, and construction began on about 40 thousand miles of new roads. The idea was to connect the new system to existing express ways and freeways. And though the s