NHTSA Complaint #11449858 — 2020 TESLA MODEL Y

While using the autopilot the car will suddenly slow itself even though there is nothing in front of the car. It happens most often when approaching a large vehicle or truck that is in the lane next to the car. It seems as though the autopilot system is spooked by the truck even though it is staying in its lane. Similarly, there are 2 spots on I-25 in Colorado where the sudden braking happens regardless of what is around the car. It may to do with recent construction because in both places the car slows suddenly at the same point nearly every time I pass through. It was happening at one of these spots after the construction had moved the lanes. The lanes were marked very well and the car had no problem before or after this point. But when passing through the car suddenly slows. The danger is that a car driving behind me would not expect the car to slow down for no reason. A potential rear-end collision danger. Happy to give more detail to add context.