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While braking suddenly is something that can happen on the roads, it’s still a potentially dangerous maneuver. It’s often better than the alternative (crashing into something/someone), but there’s still risk involved.
If these vehicles are doing panic stops frequently and unnecessarily, that’s a major problem. It’s a common type of insurance fraud, for starters.
I wouldn’t be surprised to find that the computer has a faster initial braking response whereas it takes time for peoples’ feet to fully depress the brake pedal. A shorter time from the brake lights coming on to the brakes being at full service pressure.
Essentially no processors follow a standard. There are some that have become a de facto standard and had both backwards compatibility and clones produced like x86. But it is certainly not an open standard, and many lawsuits have been filed to limit the ability of other companies to produce compatible replacement chips.
RISC-V is an attempt to make an open instruction set that any manufacturer can make a compatible chip for, and any software developer can code for.