Do cars have safety features?

Yes, cars have lots of safety features but motorcycles don't.

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If there is a leak can fix a flat be used to seal the leak?

No. Fix a flat is an expanding foam that would completely block any pipes or hoses it coam into contact with. you really need a product called radweld.

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What are the safety features of a modern car compared with a very early car?

seat belts, air bags, antilock brakes, inertia fuel cutout, disk brakes, reverse lights, head lights, horn.... Just about everything on the car is safety related and has evolved since the early models

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