Please, don't know how to describe this, so please try for yourself and rapidly push acceleration button. You can clearly hear engine sound acceleration effect loading up again with each press. Biggest engines like D and E type don't have this problem. From K-700 and less, this problem appears.
If you want to read detailed description:
So i have a Steam Controller, playing whole bouch of games. Controller has a trigger button, so i can adjust how many torque i want with truck just like with leg in your car. But, when ever i do a little realse, or push a bit more, the sound effect loads up again, and truck is screaming each time, so its anoying. Back in day the original game has this thing fixed. The problem appeared just before few fixes in original game way way back in time.
Thank you! Have a good day.