why they made cars so fast and limits the speed on the roads (highway)
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Two reasons:
1. there are still roads without speed limit (hello German Autobahn!), and car manufacturers won’t design and develop two different models just because of that
2. the real reason is that there’s a difference between max speed and cruise speed. A car is designed to run at cruise speed, which is typically the general speed limit of the highest tier of overland routes, e.g. US Interstates. At those speeds, the car should run smoothly, silently, and fuel efficient. It wouldn’t work if that was also the speed limit of the car, because that means it would then require “petal to the metal” driving to cruise at that speed. Alternatively, manufacturers would have to limit the speed in other ways (BMW and Mercedes-Benz limit their cars’ top speed to 225 kph, which is about 140 mph), which would be very unpopular for lower speed limits and would be dangerous in practise when considering overtaking etc.
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