If you have limited a car's maximum speed to 120 km/h (or any other value), but the car still accelerates to 100 km/h, there could be a few potential reasons for this:
Limiting System Issue: There might be a problem with the speed limiting system itself. It could be a malfunction or a technical issue causing the speed limit not to be enforced properly. In such cases, you may need to have the system checked or repaired by a qualified mechanic or the manufacturer.
Environmental Factors: Speed limiting systems are typically designed to restrict the car's speed under normal driving conditions. However, factors like steep downhill slopes, strong tailwinds, or road conditions that allow for greater acceleration may temporarily override the speed limitation.
System Tolerance or Calibration: Speed limiting systems may have a tolerance or calibration range built into them. This means that the actual speed might slightly exceed the set limit within a certain margin of error. The extent of this tolerance can vary depending on the car and the specific system in place.
Driver Error: It's also possible that the car is operating correctly, but the driver is inadvertently accelerating beyond the set limit. This could be due to a lack of awareness or unintentional pressure on the accelerator pedal.
If you are experiencing consistent issues with the speed limiting system not working as intended, it's advisable to consult the car's manufacturer or a qualified mechanic to diagnose and address the problem. They will be able to provide specific guidance based on the make, model, and design of your car.