My car has a speed limit detection system using a camera and a button I can press to change the speed limiter to the current detected value. It works most of t

My car has a speed limit detection system using a camera and a button I can press to change the speed limiter to the current detected value. It works most of the time, but where it doesn't, it would be a major pain if it was automatic or audible. My onramp to the Autobahn is limited to 80km/h due to a construction zone with the same limit on the Autobahn itself that ends just before the merge. The limit on the Autobahn is ended with a sign, but the one on my onramp is not. Technically I would have to keep driving 80 until I reach my exit, because that was the last posted limit and there are no other signs to change that. Since there are no signs, my car keeps showing me the 80 limit all the way. Realistically I can see the canceled limit sign across the bit of grass and divider at the end of the constructio,n and drive whatever speed seems appropriate in this unrestricted stretch. If the system was audible, would it beep at me the entire way? If it was automatic and try to limit me to 80, I'd cause a major traffic jam, because I'd be constantly passed by every single truck, blocking both of the available lanes. Their speedometers are better calibrated than mine, and I'd be going 77 while they keep at 89.