Beautiful. I am glad that you went 4k some time ago as video gained on quality and durability. Stay well, drive safe. PS: Think about to rename the title of the video and use ''cab ride'', ''drivers view'' and similar words that viewers can find you. This is a video that certainly has a lot of viewers if only they would be bale to find it. Video slightly sticks. It should run perfectly smooth instead. Check memory card. It needs to be quality enough to be able to follow the 4k camera data traffic having speed and memory capacity in mind. If it is insufficient than pictures are lost and video tend to stick - does not run smooth. When switching to 4k are often the same MC used. Which turns to be a mistake as they might work well HD mode but are obsolete recording 4k mode due to 4x more data recorded. You might need to buy a new one. Hints: Always film on sunny days when driving away from sun. Always have windows perfectly clean from inside and outside (it is a must to clean it before filming - from inside too - if only you want a high quality video) of camera outside. Sound: use wired microphone and put it somewhere where win sounds will not be an issue and - if you want it - you will still have a privacy in the cabin. Consider to film this beautiful line again on ''video non sticking mode''. If you are using GoPro version 7 than go for version 10 or 11. Version 7 has that ''vertical structures bending'' issue which is not present at later version anymore.
All you'd hear would be the loud whine of dynamic brakes going through the tunnel from east-to-west. In the opposite direction, the sounds would be very different.
Lots of people don't like watching 20 minutes of darkness, but rest assured, I have the entire tunnel clip in a separate video specifically for gentlemen like yourself, check out my other videos 😁
