Well if you want to mockup a full semi over your Niro, then everyone will be OK with you not moving with traffic. I find most buses accelerate a lot faster than I do incidentally. I tend to tuck behind slower vehicles at a stop light by picking the lane most likely to go slow. But once there, I don't lag much behind the rate they set.
If you utilize a sign or a finger, now there is now zero doubt that your are contributing to road rage. What's the point of that?
2018 Kia LX HEV Metal Stream with Advanced Tech