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Bike

Car

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 yes greenhouse effect gases emissions. They are evil, dirty, smelly and noisy and will kill you.
Safety knee pads and elbow pads are necessary and especially a helmet Numerous safety features, high speed impacts during crash, may still prove fatal
Maximum speed 35-40 mph 140-200 mph

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