2024 FREIGHTLINER CASCADIA Forward Collision Avoidance Warnings Problems

The forward collision avoidance system fails to distinguish stationary objects from animate objects resulting in immediate engagement of the braking system.

The cruise control (level 2 autonomous) will turn itself off without any warning sometimes. This happens any time the truck is set for above the speed limit by more than 2 mph. The truck uses a speed limit map, independent of actual posted speed limits. When the truck detects a speed limit drop to below the cruise setting, either real or imagined, the cruise control disengages without any warning or notification. This is a problem when I expect the truck to continue its autonomous function in traffic situations, but it does not, and without warning. The system will even disengage while it is operating; it will be slowing or maintaining a following distance, then disengage. The driver has no idea if the truck is still auto-driving until he is close to a rear-end accident. Also, bear in mind that speed limit signs are often only posted on the right side...

When approaching stopped traffic, sometimes the truck will respond and begin to slow down. At other times, the truck will continue at set speed toward a detected stopped vehicle, and in situations where the time and distance are way too short to justify no reaction by the system. The truck at sometimes acts like it is auto-driving; at others it acts as if it is only in crash-mitigation mode, and will wait for the driver until the last possible second and then slam on brakes. There have been some times where the truck actually gave a collision warning (alarm and display turns red), but in no way attempted to slow itself. This happens with vehicles detected in the truck's headway for multiple seconds beforehand. In short, the truck will sometimes apparently allow itself to rear-end a vehicle in front of itself, even though the sensors detected it and it had...

When a vehicle is merging into my lane, the truck will often not detect or react to the encroaching vehicle; this happens even when there is plenty of space, and the encroaching vehicle is halfway into my lane. I have had to intervene several times, since the truck was accelerating toward the previous vehicle in my headway, and ingoring the intervening merging vehicle. In contrast, the sensors in the truck apparently can see when a vehicle is near to the front, and mostly out of the headway of the truck (only part of the front vehicle in my lane, like when exiting). This truck will brake, and continue braking unnecessarily (and unnecessarily hard braking) for a vehicle that is completely out of my lane (by several feet), before continuing and regaining speed. This shows that the sensors are capable of "seeing" and tracking the vechicles, but still does not respond...