In science we use tried and true formulas to find out the stopping distance of a vehicle. s = (0.278 × t × v) + v² / (254 × (f + G)) Where... s - Stopping distance in meters; t - Perception-reaction time in seconds; v - Speed of the car in km/h; G - Grade of the road, expressed as a decimal. Positive for an uphill and negative for a downhill; f - Coefficient of friction between the tires and the road No matter how I enter the numbers, a modern mass production car cannot stop from 140 mph in 380 feet regardless of the reaction time. The real stopping distance from 140 mph on dry pavement and a reaction time of 1.5 seconds is over 1,245 feet. This is calculated assuming good tires, brakes, and perfect road surface. Without breaking the laws of physics, what you claim is impossible.

@@NotExpatJoe 1. If your reaction time is 1.5 seconds, you will fail your driving test. The average reaction time (seeing something happen, then actually responding to it) is about 450ms. 2. Your numbers don't matter when there are real world examples of that being done. Look up the video "Stopping Distances: Real World vs Highway Code" That car was consistently able to stop in around 50% shorter distance than what the highway code states. At 70mph, it was able to stop in 130ft. 130ft x 2 + 5% is 273ft. The extra 5% is for margin of error. Throw in the travel distance for the reaction time which at 140mph is 92ft, brings the stopping distance up to 365ft. 3. The stopping distance taking 1245ft is approximately an average of 0.29g braking force. A modern car with, as you say, good tyres, brakes and perfect road service, is able to brake at about 1g. If it's a performance car with a lot of downforce, that can be as high as 1.3g at higher speeds, slowly coming down to 1g at lower speeds.If your car has a maximum braking force of 0.29g, your car is unsafe to drive on the road and you need to get it repaired immediately without driving it. It needs to be towed. 4. I've actually done that and measured it. I had the opportunity to drive on a runway long enough to get up to that speed and then stop again without crashing. Unfortunately I didn't record it but my 1995 Lexus LS400 with Michelin Pilot Sport 4 tyres and EBC Ultimax2 discs and pads was able to stop in 380ft from 140mph.

@@jackedrussell Quoted from driver manual; "It takes drivers approximately 1.5 seconds to see a hazard and recognize it. This is called perception time. Next, it takes a driver approximately one second to physically react, take their foot off the accelerator, and put it on the brakes. This is reaction time." When you add perception time and reaction time together, it is often over 2.5 seconds. I haven't watched the test, I will, but I am already thinking they are not including perception time in the test. I can react extremely fast when I know I am being tested, not so much when I am day dreaming about titties and not paying attention. 😅

@@jackedrussell I watched the test you referenced but their results are completely useless. He was on a set course with neither perception or reaction time taken into account. They elimated most of the variables so, of course the test results showed a shorter stopping distance than the highway code test.

@@NotExpatJoe I took the fact that the stopping distance in that video didn't t have any reaction times into account and added an extra 93ft to the total. The average perception-reaction time according to multiple studies is 0.65 seconds. The only places I could find that said 1.5 seconds is replies on Quora, which isn't exactly the best source of information. Harvard is far more trustworthy than a website that says it's safe to mix bleach and ammonia. But going on what you say, that's 496ft at 1.5 seconds. Or more conveniently for you because you've increased it to 2.5 seconds now, 591ft. Still less than half of what you said is impossible without breaking the laws of physics. If your reaction time is genuinely that slow, stop driving immediately. At 20mph, it would take you 73ft or 5 car lengths to react to someone stepping out in front of you while you're driving in a school zone. If you're in a residential zone, it would be 110ft or 7 car lengths. If you're 100% serious about your reaction time being 2.5 seconds, you're going to end up killing someone one day. By the time you've realized someone has walked out in front of you, you would have already hit them at full speed and traveled a good 2-3 car lengths before you're on the brakes.

Most drivers only look about 50 feet in front of their car and is why the reaction times are so bad. Looking as far out as you can and scanning up and down the road prevents all of this. This is actually taught in drivers ed but very few people practice it.

yes

@luchador5341 Everyone is “good” with and speeding until the unexpected happens, talking frm experience

@@ThatFoo.frmTha713. there is nothing wrong with traveling at a high rate of speed. That doesn’t kill you. Suddenly coming to a stop does.

@@itsjusts_am yes there is , also u sound stupid. Wait till u have over 10 near crashes n over 30 near death experiences like me then you’ll start thinking n talking differently

@@itsjusts_amstraight from the mouth of a brilliant genius

This isn’t Germany. American roads are 19th century compared to German high-speed roadways, German cars have much stricter regulation, and Germans are far more conscientious about following traffic laws...they don’t get their driver’s license from a box of Fruity Pebbles like tailgating lunatic Americans do. And 40% of the Autobahn has speed limits, particularly on stretches w/ higher congestion.

You do know that the stretches of the Autobahn that don't have any speed limits have more crashes and deaths than the part with speed limits?

@@ViktorNyberg Certainly speed unrestricted zones have more accidents than speed restricted. The question is how speed unrestricted zones compare to American interstates. I felt much safer on the Autobahn than Hillsboro TX

@@ShakaCthulu Germans have WAY better training and has nothing to do with the roads. A good driver can handle any type of road with ease.

This doesn't take reaction time into account. When you include reaction time, the stopping distance is closer to 300 feet.

Hell no

No

Lower the driving age to 15 and make the road test actually challenging. Some of these people need to be off the road and I’m mostly talking about older people. You should have skill and understanding behind the wheel in order to be allowed to drive

no

​@@loganr.666Leave it at 16 with a challenging evasive driving test. Older than 45 must redo challenging road test. Can't get a license past 65.

My Audi S4 has Brembo Ceramic brakes so, it'll stop way before your's as well.

​@@SuperEman500my volvo has performance breaks not sure on the brand but pulls up in about 38m from 100kmph so 120m is completely incorrect it might be if you have slicks and worm break discs and pads.

who asked

Why are you assuming that the brakes on your car is the weakest link? Tires and surface might make your expensive brakes as good as a rusty Lada.

You have no idea how brakes work those breaks are for going around track depositing loads of heat which there designed to handle. as far as stopping distance is concerned they may only give you a couple of meters over the eco box.

@@KayLa-sq7cv Haha, no these brakes are designed for autobahn use, going from 155 to 80 in a blink.

It doesn't matter if u r car is a supercar and has extreme braking technology and safety features will make your car safe when you hit extreme high speed none of that will help u except momentum to kill u. Ask any professional drivers drive safe my friend

@@cbrshiva6762 bro you are momentum can kill you but think of straight line driving there could be many situations but mostly higways are straight if you see cars runnning on Autobahn where you have no speed limits many drivers manage to do emergency Slow downs from higher speeds this could be a more than 100kph slow down in few Seconds but if you drive a low end car on high speeds momentum surely kills you. there is big difference between a XL Heavy Duty and CBR in terms of stopping.

@@cbrshiva6762 Nope, Brembo Ceramic Brakes have a MUCH shorter distance when braking in extreme situations, I have a Audi RS5 so i know this personally.