Traffic Sign Recognition, Detailed Information - GF54.30-P-0022-01A
Model all (CAR)
with code 504 (Speed sign recognition)
Model all (CAR)
with code 513 (Road sign recognition system)
Overview
This document contains information on:
- General
- Function
- Recognized traffic signs
- Additional information for evaluation
- Representation of derestriction signs
- Local and development limits
General
The speed sign or traffic sign recognition detects traffic signs, reads their information content, and forwards it to the driver. The system distinguishes between different traffic signs.
Function
Recognized traffic signs
The multifunction camera recognizes the following traffic signs:
Example illustration of traffic signs
Additional information for evaluation
Possible additional signs include limits in wet conditions or during trailer operation. If, for example, the windshield wiper is activated and a speed limit with additional restriction "in the wet" is detected, this speed limit is displayed.
The speed limit is not viewed to be relevant as long as the windshield wiper is not activated. Supplementary signs not relevant for passenger cars (e.g. speed limits for trucks) will not be shown. The number of these traffic signs amounts to approx. 10% of all traffic signs.
Representation of derestriction signs
Driving past a derestriction sign (F) with no further speed limits causes the derestriction sign to be displayed (J).
In no-passing zones, the prohibition sign disappears a no-passing derestriction sign is passed (I).
Example illustration of derestriction sign
Local and development limits
The multifunction camera also takes into account information from the navigation system (vehicles with Connect 20 multimedia system).
Since speed limits may be changed, the digital map data must be updated regularly. Information on the classification of roads and regional development is deduced from the map data. By this means the system recognizes that the vehicle is leaving a road for which a speed limit identified earlier was displayed.
Since the picture recognition system is unable to cancel the display of a speed limit identified outside a town/village when passing a town/village entry sign, use is made of the map data. When changing from an undeveloped area to a built-up area, the speed limit of the map data is used. The town/village limits do not always match the built-up area markings from the map data. As a result, the last displayed speed limit may disappear too soon or continues to be shown in the town/village.
Situations which lead to a failed cancellation or superfluous cancellation of this display are shown in the following pictures:
Example illustration of local and development limits