> 300 km/h [..] normal untrained person is safe to drive on the German autobahn
German here. No normal untrained person should be driving at those speeds. The general recommended speed for the autobahn is 130 km/h. Typical speeds on the middle and left lanes are up to 200 km/h though most days the typical "high" speed is probably closer to 170 or 180.
With good weather, no traffic and no roadworks (hah) you might be able to go over 200 km/h for a while but unless it's a long straight stretch you're probably way out of your comfort zone unless you're an experienced driver.
I would say a normal untrained person is safe to drive at speeds up to about 180 km/h. Most ordinary cars seem to handle noticeably worse with every 10 you go beyond 160 km/h or so.
And of course the entire discussion of typical speeds is philosphical when most of the Autobahn has speed limits (roadworks often limit the speed to 60 or even 40 km/h (or less) and even on normal parts the speed limit frequently is as low as 120, 100 or 80 km/h).
This depends on the car, the better the car, the more stable it feels at higher speeds, especially when maneuvering. In cheap weak ones 130 kmh feels like it's taking off, in great ones 200 kmh feels... adequate.
I got once 220 kmh with by older BMW 330d on unrestricted part of German highway, but it's quite stressful experience. You feel via your senses how fast everything is, you feel how long it takes for car to break to something more reasonable (ie 150) because of other drivers - this happens all the times, so it's almost never a smooth ride. And you know that any issue with the car like tire blowing means instant horrible death, and probably not only yourself.
Most normal tires have rating till only 220 (that is for new ones!), at speeds around 250 and more you will trash whole tires in 1 day (and you need good ones, not some cheap chinese crap with no grip), and whole car is just suffering much much more compared to regular driving.
Interesting one time experience, but even me I don't go over 150-160 on an empty road during day.
Even 250 km/h is a bit extreme for "normal" drivers. See your sibling comment -- even if the car can do 250 safely it can be very difficult to drive safely at those speeds.
German here. No normal untrained person should be driving at those speeds. The general recommended speed for the autobahn is 130 km/h. Typical speeds on the middle and left lanes are up to 200 km/h though most days the typical "high" speed is probably closer to 170 or 180.
With good weather, no traffic and no roadworks (hah) you might be able to go over 200 km/h for a while but unless it's a long straight stretch you're probably way out of your comfort zone unless you're an experienced driver.
I would say a normal untrained person is safe to drive at speeds up to about 180 km/h. Most ordinary cars seem to handle noticeably worse with every 10 you go beyond 160 km/h or so.
And of course the entire discussion of typical speeds is philosphical when most of the Autobahn has speed limits (roadworks often limit the speed to 60 or even 40 km/h (or less) and even on normal parts the speed limit frequently is as low as 120, 100 or 80 km/h).