May 24, 2012 Jeff Jacoby: The peace process battered Israel's reputation Near-nuclear nation threatens to walk out of summit unless it gets its way Clifford D. May: What Iran's Rulers Want Michael Muskal: 'Pro-choice' position hits record low, according to poll Chris Farrell: Are We in a Tech Bubble? Kimberly Lankford: Switching Medicare Advantage Plans Mid-Year Bryan McIver, M.B., Ch.B., Ph.D.: Mayo Clinic Medical Edge: Understanding hyperthyroidism and its variety of treatment options French rights groups want Google to stop suggesting 'Jew' Two-fly rule for Beijing toilets The Kosher Gourmet by Penelope Wall: PHILLY CHEESE STEAKS --- hold the steak! May 23, 2012 Ex-CIA spy in Iran's Revolutionary Guard: Baghdad talks highlight Western naivete Putin's latest defiance shows Obama's whisper didn't work Tony Pugh: More private colleges offering tuition discounts Lisa Gerstner: 4 Money-Etiquette Questions Answered Mary Beth Franklin: How to Choose the Right Annuity for You Art Markman, Ph.D.: Get smart: How to bulk up your creativity muscles Israeli scientists use skin cells to help repair heart muscle Tina Susman: The wig wasn't enough: Man gets 13 years for posing as his dead mom The Kosher Gourmet by Emma Christensen:A simple way to do fish right May 22, 2012 David S. Cloud and Kathleen Hennessey: Obama changes mind on Pakistan invite to NATO summit --- and then gets dissed by country's president US Senate approves new sanctions against Iran ahead of Baghdad talks Warren Richey: Can US group challenge overseas surveillance act? Supreme Court to decide Supreme Court: Twins can't claim dead dad's benefits Thomas M. Anderson: Walking Away From a Mortgage Environmental Nutrition editors: The lowdown on a low-acid diet Pomegranate juice maker used deceptive ads, FTC judge rules Relatives outraged over spoof on Hamas chief's killing The Kosher Gourmet by Megan Gordon: Enjoy a celebration of the most rich and layered flavors: Black bean, sweet potato and quinoa chili May 21, 2012 Mark Clayton: Cybersecurity: How US utilities passed up chance to protect their networks Howard LaFranchi: NATO summit: Who will foot the bill for long-term Afghanistan security? Chris Farrell : Earn Dividends in Emerging Markets with This WisdomTree ETF James K. Glassman: 5 Stock Picks Among Online Retailers Stephen Whiteside, Ph.D. : Mayo Clinic Medical Edge: Social anxiety disorder --- or just shy? 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What you need to know before you buy Kathy Kristof: Our Practical Investor Fights Inflation with These 6 Investments Sue Hubbard, M.D.: The Kid's Doctor: Lactose intolerant young child? Check again Environmental Nutrition Editors: Get the facts on palm sugar sweetening The Kosher Gourmet by Kathy Hunt: Spread a Little Excitement with EXOTIC CONDIMENTS (4 RECIPES) May 14, 2012 Richard Simon: Purple Hearts for domestic terror victims? Nando Pelusi, Ph.D.: The privacy paradox: Surrounded by strangers, we risk isolation, anxiety Chris Farrell: Investing Lessons from the Great Recession Lisa Gerstner: How to Protect Your Identity, Finances If You Lose Your Phone Harvard Health Letters: Heart disease and dementia Tiffany O'Callaghan: New hormone mimics effects of exercise without the sweat The Kosher Gourmet by Megan Gordon: MANGO COCONUT OAT MORNING MUFFINS are a bright but hearty delight May 11, 2012 Rabbi B. 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Loiko: Putin sends warning to U.S., NATO in Victory Day speech at Red Square Mary Rourke: How being a 'mentch' got Vidal Sasoon his start and fighting in Israel's War of Independence provided him with confidence and a strong sense of his own identity Harvard Health Letters: Palliative care: Underused therapy yields surprising benefits Jeff Bertolucci: Get Home Phone Service for Less Than $10 a Month Rachel L. Sheedy and Susan B. Garland : Make the Right Moves to Boost Benefits The Kosher Gourmet by Betty Rosbottom: Gleaming with its golden, crimson, and snowy white hues, this silken smooth and creamy STRAWBERRY ORANGE TRIFLE looks impressive, but is easy to prepare May 9, 2012 John Rosemond: Parents, stop destroying the American male Valerie J. Nelson: Maurice Sendak, author of 'Where the Wild Things Are,' dies at 83 Bob Frick: Angst Over Annuities Sharon Palmer, R.D. 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Jewish World Review How Personal Rapid Transit works By Marshall Brain http://www.JewishWorldReview.com | (MCT) Most of us are familiar with the idea of a "rapid transit system." New York City's subway system is one of the oldest and best known examples in the United States. Parts of the NYC system are more than a century old. Cities like Atlanta, San Francisco and Washington, D.C., have more modern systems built in the 1970s. Phoenix has a light rail transit system that is brand new. But on the horizon there is a new form a rapid transit that will change the way people think about getting around in urban areas. These systems are know as personal rapid transit systems, or PRT systems. The PRT concept has been around for a long time, but the technology is just getting to the point where the first systems are now being installed. For example, Heathrow airport in London is installing a PRT system that will move people from a parking lot to the terminal (http://www.atsltd.co.uk has details). Although there are many different PRT systems on the drawing boards right now, they all share some basic characteristics. The first and most obvious of these characteristics is small cars. Instead of giant trains that carry hundreds of passengers, a PRT car is sized more like an automobile. This is where the word "personal" comes from in the name. The car might typically hold two or four people depending on the design. The second characteristic is the number of stops. In a typical rapid transit system that uses trains, the train stops at every station. There might be a few "express" trains that bypass some stations, but frequent stops are the norm. In a PRT system, your car travels straight to its destination, skipping past stations along the way. When it is time for your car to arrive at the station, the car moves onto a siding or a loop track so that you can get out. What this means is that you have a quick, non-stop trip to your destination. The third characteristic is automated control. The cars in a PRT system are driven by computers. As a passenger, you do not have to do anything beyond getting in the car and choosing your destination. The control system handles the speed of the cars, the spacing between cars, the merging process and all track changes. Finally there is the track that the cars ride on. In a PRT system, the track might be a narrow concrete roadway, a concrete monorail, or steel tracks like a steel roller coaster. If you have ever been to Disney World and looked at the track for the monorail trains there, you can see that it consists of a very simple concrete beam elevated on concrete posts. The advantage of this simplicity is very low cost for the track. It is far less expensive than railroad track or highway lanes. Because the cars are small and light and the track is simple, you get another advantage. The track can fit into relatively small spaces, and it is easy to elevate. So PRT track might run down the median or the shoulder of existing highways and streets. Track can also squeeze between buildings. This further reduces the cost of a PRT system, because there is no need to acquire right-of-way. The low cost or PRT track means that you can lay more track and build more stations. That makes the system more useful to passengers, so more people use the system. In a city that suffers from sprawl, this advantage might mean the difference between success and failure for a transit system. But the real advantage of the PRT system is convenience. In a normal rapid transit system or bus system, trains and buses might only run every half hour, or even every hour. The schedule can be very inconvenient for passengers. In a PRT system, individual cars are waiting for you when you arrive at the station, and you travel straight to your destination. It is potentially more convenient than an automobile because you don't have to worry about parking at your destination. Pay attention to the news over the next year or so. We should be hearing more about personal rapid transit because it looks like its time has come. Every weekday JewishWorldReview.com publishes what many in the media and Washington consider "must-reading". Sign up for the daily JWR update. It's free. Just click here. Comment by clicking here. Previously: How 3G works How the Global Position System (GPS) works How octane works How cruise missiles work How submarines work How miles work How octane works How food preservation works How beer works How holding your breath works How smoke detectors work How heat pumps work How your night vision works How concentrating solar collectors work How your key fob works How the common cold works How the Large Hadron Collider Works How making a TV show works How dry cleaning works How exoskeletons work How an oil refinery works How landfills work How the Orion spacecraft works The cutting edge in HDTV Redefining the CD How the HDMI cable scam works How glow-in-the-dark toys work How the subprime mortgage crisis works How gift cards work How Tasers work How giant TV screens work How foreclosure works How Air Force One works How wildfire fighting works How vitamins work How ejection seats work How reattaching limbs works How hot air balloons work How paparazzi work How counterfeiting works How CDs work How the Edsel worked How Stinger missiles work How hybrid cars work How sharks work How mosquitoes work How diesel engines work How water towers work How the Dawn mission works How Kassam rockets work How the North American Eagle works Why aren't we flying to work? How tofu and soy milk work How Colony Collapse Disorder works How airbags work How the U.S. income tax works How gum works How caffeine works How Daylight Saving Time works How a cruise missile works How snow making works © 2007, How Stuff Works Inc. Distributed by McClatchy-Tribune Information Services.

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