@@mikemeeky8550 the distance shouldn't matter at all. The angle does though. Although it does not make a difference of 37kph. The minimum height of a bridge above the Autobahn is 4.5m. Newer ones are at least 4.7m above the Autobahn. Let's assume 5m. With the thickness of the bridge and the person on top and so on let's assume the measurement hight at about 10m. He measured the car at about 50 meters from the bridge. So the angle was about 11°. cos(11°) is about 0.98 . That means the measured speed was about 98% of the actual speed. In the end the speedometer in the car usually shows too much. In my car it is about 10%. So when the speedometer is on 55kph it actually is about 50kph. At 110kph on the speedometer it actually is about 100kph. So at 260kph like in the video I'd expect the speed to be 234kph and the radar device to show about 229kph +/- a few kph from the assumptions we made. If the actual speed was 234kph and the radar device is precise, the measured speed of 223kph would mean that the angle was about 17.6°. If the speedometer was correct (and I don't think that's the case as pretty much all speedometers show too much except if it was calibrated) and the speed was 260kph the angle would have been 31° and the height of the bridge ~30m if the distance was ~50m.
Also because the speedometer shows a higher speed than the car is actually going. Most of the time 5-10% difference. They should have either used a gps speedometer or pull the actual car speed thru the obd2 connector
@@crusadebirb4084 It does show different speed but if you're seeing 260 on the speedo, you're not going 220 like shown in the video 🤣 The difference is no more than 10-15kmh at max.
@@MKD331BC Totally depends on cars. My 645i is at 256kmh gps for 260 speedo, my golf 6 tsi 160hp is 199kmh gps for 221 Speedo (645 on 275/30-20 Hankook UHP and golf on 225/45-17 ps4)
Autobahn in the USA would never work, people would go slow in all 3 lanes and people would be wrecking into each other it would be a massive shit show I wish it could be possible in the US but there’s too much entitlement and too many big egos
If only people in the USA knew how to drive, all the lanes would be more than enough (apart from specific hours, then you would still have to wait half an hour in jammed traffic but still it would be much much better)
@@jessebolno, you don’t know how radar or laser work, needs to measure at the same height as the car so not on a bridge and coming toward you so that the waves are actually sent back to the radar gun correctly.
It is not enough to buy a tool. You should use it according to the instructions I. e. You have to measure an incoming car which is heading you. Speedometer shows usually 8 km/h more than the actual speed. What you do is more or less to buy an electric hammer but use it manually (without 230v power supply).
In the EU a speedometer can show up to 10%+4kph more than the actual speed. So at 260kph indicated the actual speed can be as low as 233kph and still be legal. The rest of the difference is the angle of the measurement.
@@simsch97 This is the first correct answer! There are two laws involved: in Germany a speedometer is not allowed to show less speed than the car is actually going. The EU later made it a +10% + 4km/h rule. Car makers stay on the safe side. The only thing that this test shows is, that Alex drives his car with nice tires. Next time, put a GPS based Speedometer in the car and check again.
@@BeefVellington Yes, I feel guilty. But the guys blame the manufacturer and indirectly the hardware and software developers of the instrument by fokussing on the wrong part of the system. And testing something without verifying the test setup on all sides is pretty dump, too. So, I had to state loud and clear why the car was at least a big portion of the measurement tolerance.
Not 10% but 10kmh. That's a big difference. At higher speeds it gets more accurate. Examples, real VS speedometer (off %): 20kmh = 10kmh (50%) 100kmh=90kmh (10%) 200kmh=190kmh(5%) 300kmh=290kmh(2%)
Nope, the speedometer is usually tuned to be the most precise at 50km/h for inner city driving. I only know of the Alfa Romeo Giulia with the Quadrofoglio which has its speedometer tuned to high speeds but warns to this in the manual. When I drive 107 km/h, GPS shows 100, at 200 GPS says 189 km/h; and it is definitely correct because that is the rev limiter (and I ride the stock rims with same dimensions from factory). Also I pass speed traps at the GPS speed plus 3, works for me since 2004
@@aaallright well i used many cars in many countries mostly new car as far as i can tell cars made for Germany has much more accurate and always little bit more showing speedometers it might be showing 5km more 3km more but it is very consistent that's is my experience and i believe the reasons is while most places has 10 percent margin of error in their laws Germany has 3km error fix no matter the speed if i am not mistaken.
@@enderiskender2977 para 57 StVZO is not specific, but it is based on EU law 75/443/EWG, which states max 10% + 4km/h, but speedo must not show less than actual. Googled it out of curiosity now 😄 But it looks like that 3mm tire wear amounts already to 1% deviation, so your new winter tire will be more realistic than those old barely legal 1,6 mm summer tire
If the Golf has the standard tune on it (235hp), then it would be more surprising if it really managed to reach real 260 km/h. Because of the tuning rims, the speedometer shows more than the actual speed. In Germany (where the Video was Made) it's allowed that the speedometer shows 7% more, which means, that he's driving at around 242 - 245km/h
Probably gearing. 100HP cars here can hot 200km/h as well. So with double the power and a long enough time it might be possible. Could be still tuned though.
Theres something called cosine effect when it comes to speed radars. Basic principle it works on is by measuring distance change over time. It's programmed to measure distance from the back or front of the vehicle so every other angle you measure it from, will greatly effect the result. If you tried to measure speed from the far side it would show even smaller numbers.
Close, the radar uses the doppler effect, this only gives you the radial velocity, which is the velocity along the line of sight of the radar gun. The car isn't travelling along the radar gun line of sight, hence the discrepancy.
For vehicles registered (in Europe )after 1991, the displayed value may deviate from the actual value by up to 10 percent. (+ 4km/h) In your case 260-4=256/11=23,3 256-23,3=232,7 It’s legal that the car shows 260 but you’re driving with 233 km/h And yes the angle , you should point the laser gun flat about 100 m after the bridge then it should be more precise!! Nice video
@@plampard7813 the speedometer is not showing the exact speed but usually quite a bit more. They can show up to 10% (+4kph) more than the actual speed. 260kph-4kph=256kph 256kph/1,10=233kph (110% of 233kph is 256kph. +4kph is 260kph)
I can guarantee 10% (the max value) is not applied at any vehicle ive driven so far. At my Audi (Belongs to Volkswagen) I was once meassured at 140km/h while my Speedmeter in the car indicated 141. So this calculation does not matter at all
@@AndreasH2202 Audi is known for rather accurate speedos but it is different for the different manufacturers. My Nissan cars are both 10% off. Audi and VW don't have to be the same regarding this too.
@@AndreasH2202 the ADAC has made a test on 1400 different cars and Audi was the closest to the actual speed with only 3.1% off on average between the Audi cars. Other manufacturers were more off. Nissan for example was 6.2% off on average. Subaru 6.5% and Toyota 6.0%.
Both the instrument and the car speedometer are perfect. The difference is caused by the mistake made during using the radar. The line of measurement and the path of the car are not parallel, there is a significant angle between them. The radar is measuring the velocity component in its line and this is less than the total velocity.
Depends on if it’s a licensed and checked radar device. If it’s a aliexpress thing sure it’s not working properly. But usually a difference of 20 kp/h is normal with those speeds
Also, car speedos usually read slightly higher than irl speeds to be safe, like 1-5mph. So the actual speed it prolly around 1-5mpg slower than what the tach says.
If yall dont know this highway or whatever is the same road that the worst crash in the world happened in a Audi rs6 it crashed into a semi into that second big large pole with the sign on it and crashed in to it and wrapped a round it at 300 km/h (186 mph)
You guys got a good point about the angle that theyre reading the car from and it has to be head on, but im pretty sure thats a baseball gun btw atleast thats what I've seen that brand used for.
The problem with radar is the walls on either side and the only way to use that gun is without any other wall or vehicle for the radar wave particle to bounce off if.
This would have very small effect. The bigest reason is that he is measuring at an angle and therefore the device is not showing the total velocity but its projection into the direction of radar v*cos(θ), where v is total velocity and θ is the angle from horizontal axis parallel to the ground.
Dunno bout in Germany but in the UK, Speedo’s are set to about 15% less when going 100mph (161kmh), meaning when doing 100, you’re actually closer to 85mph. This would mean that at 260kmh on the Speedo, or 160ish mph, you’d actually be doing closer to 220kmh (130ish mph), which means this is an accurate gun.
Car speedometers read higher than their actual speed. Mine reads 10% higher than the GPS speed on my phone. 260kmh on the speedometer would be around 236kmh if the speedo is 10% biased
And here I am in Australia being told that going 101kmh will instantly kill an entire family... Lack of lane discipline and consideration of the drivers around you is what's killing families!
A police officer actually said something like this, that the speed they book you a ticket for isn’t actually your actual speed they book you for about 10-20% less of the speed you were actually going at, that’s why if they stop you for speeding you were definitely speeding.
90% of 260 indicated speed is 236 of real speed 85% of 260 iindicated is 225 of real speed Every car since 2003 year must have 5-15% overshoot when stock
The overshoot gets smaller the faster the car gets, the issue is the degree he is aiming from the bridge. Assuming the overshoot is 5% according to physics he should be holding the pistol around 29° relative to the movement direction of the car. Vm= V0*cos(x) or V0*distance_h/(distance_h^2+distance_v^2)^0.5 where V0 is the speed of the car, x is the angle, distance_h is the horizontal distance and distance_v is the vertical distance
In Germany the tachometers in cars show always a 110 % of the speed you actually drive So if your tachometer says 110 you actually drive 100 If his car says 260 you have to subtract at least 26 kmh In German driving schools you learn formulas for your breaking distances and to keep people out of trouble there are hidden securnesses
I can drive with 58 kmh trough a speed camera at a given limit of 50 5 kmh because my tachometer is 10 % off and 3 kmh because the law gives you +- 3 kmh for the inaccuracies of the speed camera Don’t test it
Yeah I've heard that the speedometer in cars tends to read high, and the reason I've heard is to keep people at reasonable speeds, since everyone goes over the limit by at least a little. For example when the speed limit is 35 and people tend to go 10 over, when their speedometer reads 45 they are actually only going 40.
Measurment angle is one thing, but speedometers in the cars are designed to overstate the speed even up to 10%. If he did true 230, seeing 260 on the dashboard would probably still be within the lines.
Thats because every german knows the GTI cant drive more than 250kph... Depending on wheels and tires the speedometer will Show +10-20 kph more than GPS. Try with Google Maps.
The guy in the Golf's passenger seat just said "vee one" when they passed the bridge. The moment the video ends he said "rotate" "Golf two four seven, cleared for takeoff runway A7 left" :D "fly runway heading, climb and maintain one one thousand, contact departure one-twentyseven decimal niner. Good day!"
This model works both ways. But is only accurate if you re perfectly head on to the target. The cosine effect would result in an under reading of the speed of the target.
Die maximal erlaubte Abweichung vom Tacho sind 10% + 4 km/h. Bei Tacho 260 km/h wären das real mindestens 232,7 km/h. In der Regel ist die Abweichung jedoch deutlich geringer (ca. 5% würde ich noch für realistisch halten, meist sogar weniger). In jedem Fall ist das Messgerät falsch. T = Tacho R = Real 1,1*R+4=T R=(T-4)/1,1 für T=260 ergibt R=(260-4)/1,1=232,7... Achja, auch mit fast über 200 km/h gilt noch das Rechtsfahrgebot.
Noch ein paar Ergänzungen: Die Toleranz ist ein Maximalwert und gilt nur nach oben. Der Tacho darf nie zu wenig anzeigen! Der Tacho geht in Wirklichkeit extrem genau, muss aber vom Hersteller auf den Worst Case abgestimmt werden. Worst Case ist der größt mögliche Reifenumfang, weil damit bei gleicher Drehzahl und Übersetzung die höchste Geschwindigkeit erreicht wird. Der Tacho ist also notgedrungen so abgestimmt, dass er mit den Reifen vom zugelassenen Hersteller mit dem größten Umfang, dem höchsten Profil, höchstem Luftdruck und höchsten Fliehkräften immer noch mindestens die reale Geschwindigkeit des Fahrzeugs anzeigt. --> Daher ergibt sich zwangsweise die Abweichung nach oben im "Alltagseinsatz". Die Anzeige des Messgeräts scheint aber vollkommen korrekt für den Winkel in dem gemessen wird...
Um where. All my speedmeters on my cars are correct and match my gps unless your talking about going fast like in the 150mph + range but that could be multiple different things as to why its off, Worn tires, wrong size tires, your differential, etc.
1. These are made to be used at the ground level 2. You should measure from the front 3. Car speedometers also lie a little bit 4. This test is worth 💩
As has been mentioned plenty of times in the comments european manufacturers are allowed to have up to 10% deviation in the speedometer, and VAG in particular loves to use all of those 10%
