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Which limitation do such systems have?

  • A.None, since the radar detects every object ahead of the vehicle and the system responds to each of them
  • B.They work only at low speed
  • C.Difficulty with stationary obstacles and with vehicles cutting in, which the driver must therefore continue to monitor
  • D.They may not react to a stationary object

Answer: D

Filtering out roadside clutter also risks ignoring a genuinely stationary vehicle. The last option adds the cut in problem, which makes it a correct and fuller version of the same answer. The shared behaviour explains why these belong together and the differences explain why both exist. Checking which component actually carries the load settles most questions of this kind at once. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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