In 100 years cars will be history. They simply use far too much energy, take up far too much space in terms of roads and parking (keep in mind that real estate will be at a premium), are too large and heavy, need too many resources to manufacture and maintain, and produce too much heat. So bicycles or bicycle like vehicles, which have none of these drawbacks, will over time completely replace cars. This may seem like going backwards in technology but resources will limit wast in mobility. Plus riding a bike will be good exercise for maintaining health while getting from one place to another.
Bikes are suitable for commutes of 5 or so miles across town. Bicycle paths will be one sixth the area that streets are today for cars and mostly underground. Parking spaces will be 20 times smaller than for cars. Motorized tricycle trucks and emergency vehicles will run automatically when needed without drivers and manned by robots. Roads will last hundreds of years without maintenance since bikes are so light. Bicycles for everyone’s use at free kiosks everywhere allow people to easily ride to their destination and left at a nearby kiosk for someone else use. There will be well-lit bicycle subways crisscrossing cities to make commutes shorter connecting to buildings along the way which are far more hospitable than riding in the hot weather above. Ventilation of these subways will be less complex than today’s subways since there are no exhaust gases or heat to carried away. Everyone today imagines automated powered mobility devices of the future but when it comes down to energy and resource efficiency and exercise bicycles are the perfect mobility option. They may look different that those today but they will essentially be functionally the same. They are simple and use zero energy source other than the rider who also gets low impact exercise. And maintaining an infrastructure for bicycles is very simple. For the handicapped and very young there are small electrical smart tricycle alternatives or even electrical wheelchairs.
Mass transit will run underground crisscrossing most cities less extensively than bicycle tunnels where people can easily bike to and take to other more distant places. Bicycle kiosks will be available at each transit station for people to use. As a guess mass transit may resemble long pneumatic tubes pushing each pod carrying up to 10 people to various destinations. It is possible that each transport pod will have its own power source such as a fuel cell for generating locomotion such as magnetic levitation motors or pneumatic pumps. Who knows what technology will exist. Transporters might exist in the future like in Start Trek though I feel this will take more than 100 years to develop.
Transportation to further locations through space by ionization ram jets boosted by electromagnetic catapults to some speed and altitude before the ionization ram jets take over may carry relatively small numbers of people relatively quickly to distant locations. The ionization ram jets will heat air entering the jets to perhaps millions of degrees ionizing it to creating enormous kinetic energy. When in near space conditions they will turn off and the vehicle glide for long distances before descending back into the atmosphere when the ram jets take over again until landing.
It is also possible that super-submarines carrying tens of thousands of people will move more slowly between continents in great comfort. Submarines using huge salt water electromagnet drive engines powered by Fusion Reactors described in Part 3 – Energy will move large quantities of sea water at high speeds of perhaps 200 mph through electromagnetic engines for cavitation free, low friction propulsion, at speeds upwards of 150 knots. A frictionless membrane material or some other technology to lower drag under water will cover the surface of these submarines. They will also be geometrically shaped for least drag resistance. Submarines are quite suitable for ocean travel to avoid severe storms at the surface due to global warming. New technology will chase large sea animals out of the submarines path with sound waves and give long rang 3D visibility for many miles ahead even in murky waters for collision avoidance. Computers will run these subs. Similar subs for hauling freight will exist. Surface vessels will simply be too exposed to the elements for long ranged travel due to frequent mega-storms at sea from Global Warming.
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