Limitations of Road Sign Information

The Road Sign Information (RSI1) function may have limitations in certain situations.
Examples of what can reduce the RSI are as follows:
  • Faded signs
  • Signs positioned on bends
  • Rotated or damaged signs
  • Signs positioned high above the roadway
  • Fully/partially obscured or poorly positioned signs
  • signs completely or partly covered with frost, snow and/or dirt
  • digital road maps2 are out-of-date, inaccurate or have no speed information3.


The RSI function may interpret some types of bicycle rack, connected to the electrical socket for trailers, as a connected trailer. In such cases, the driver display may show incorrect speed information.


The function uses the car's camera unit, which has some general limitations, see the "Limitations for camera unit" section.
  1. 1 Road Sign Information
  2. 2 In cars equipped with Sensus Navigation.
  3. 3 Map data with speed information does not exist for all areas.

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