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Number of wheels 2 (sometimes with training wheels) Four, usually, however smaller cars may rarely have three wheels, as with the BMW Isetta and Reliant Robin.
Number of seats from 1 to 3 some have just two, some have three, some four. the majority have five. vans etc have sometimes 12. people carriers normally have 8 or 9.
Pollution Almost none. Only needs a bit of oil and rubber (tires, etc.) greenhouse effect gases emissions. They are evil, dirty, smelly and noisy and will kill you.
Maximum speed 35-40 mph (on "normal" bikes. World record: 133.78 km/h (83.13 mph) Flat surface, unpaced) 140-200 mph
Safety Helmet, gloves and closed shoes are essential. Numerous safety features, high speed impacts during crash, may still prove fatal
propulsion Human legs muscle powered. petrol : either unleaded or diesel
Uses Very versatile, can be used for commuting, fun, exercise, racing, load, etc. to travel distances that takes too long to get to by using bikes, etc
Pros Your food is your fuel. Almost no pollution. Very quiet (almost zero noise). Extremely high cost/benefit. Cheap. Easy and low maintenance. Gives you better fit and health. You can ride more freely than any other vehicle. They are quick to refuel
Cons Traffic and weather can be an issue, specially WIND. You get tired, but that depends on many factors. Fragility. You may get hurt in a fall, but hardly die. They are horrible for everything. They are too noisy, belch dirty black smoke, and make roadkill. They are evil and noisy and dirty.
horsepower Up to 2hp (peak of pro cyclists). 100 -200

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