Traffic Sign Recognition, Basic Function - GF54.30-P-9901A
Model All (CAR)
Overview
This document contains information on:
- General
- Function requirements
- Function
General
Speed sign or traffic sign recognition evaluates the information on traffic signs and interprets its meaning. This enables identification of the maximum permissible speed and passing restrictions for the current route. It also enables identification of crosswalks or access restrictions. This information is displayed to the driver. Restricting supplementary signs, such as speed limits in wet conditions, are also taken into account.
The driving speed is compared with the permissible maximum speed.
The detected maximum permissible speed can be adopted as the new specified speed.
If set appropriately by the driver, a warning indicates when the permissible maximum speed is exceeded. No-entry signs are also recognized and the driver is prompted to check his direction of travel, if necessary. The driver can also be warned about people in the vicinity of crosswalks.
In vehicles with Traffic Sign Assist, the traffic sign recognition system evaluates additional information from the digital road map of the navigation system.
As of the market launch of model 223, the system also supports the driver during right-of-way and intersection situations as well as in unclear and changing situations (variable maximum permissible speeds, e.g. on sign gantries or construction sites). "Additional warning contents" can be activated on a country-specific basis. These include a warning for pedestrians located in the sensor-detected danger zone at pedestrian crossings. The system can also warn the driver against driving against the permitted direction of travel before they drive into roads or roundabouts, and provide a two-stage warning before unintentionally driving past stop signs and yield signs.
Traffic sign recognition can reduce the risk of traffic collisions or accidents. Traffic sign recognition is operated via the multimedia system.
Function requirements
The following conditions must be met so that traffic sign recognition can be activated:
- Terminal 15 R on
- Vehicle moving forward
Function
The multifunction camera behind the windshield detects traffic signs e.g. at the edge of the road, on sign gantries or at construction sites. The integrated picture recognition module evaluates the picture data from the multifunction camera. The navigation system (vehicles with Connect 20 multimedia system) provides information from the digital road map.
When determining the maximum permissible speed, the traffic sign recognition system also takes into account the following information:
- Actions of the windshield wiper system that indicate rain and a wet road.
- Outside temperature, from which the danger of slippery conditions can be derived.
- Trailer operation (vehicles with trailer hitch); different regulations apply for journeys with trailers.
In addition, the traffic sign recognition system evaluates the following function-relevant parameters:
- Engine operating state
- Direction of travel
- Vehicle speed
- Vehicle longitudinal and lateral acceleration as well as yaw rate
- Distance and angle to other road users and objects
- Steering angle
Traffic sign recognition is continuously active in the background. In other words, the traffic signs are continuously recorded by the multifunction camera and evaluated by the integrated picture recognition module.
The picture recognition module compares the image data with stored data records and assigns credibility levels to all results. This allows the traffic signs to be matched to the respective valid road traffic regulations.
The multifunction camera evaluates both circular and square contours. Speed limits, prohibitory and derestriction signs are detected, including restrictions in countries with signage according to the Vienna Convention as well as in the USA and Canada.
Non-relevant signals (supplementary signs that, for example, are relevant for a turnoff lane) are ignored.
If route guidance is active (vehicles with Connect 20 multimedia system), supplementary signs will still be shown immediately if they are relevant for the active route guidance.
Inadvertent "wrong-way" driving can be prevented by the visual and acoustic wrong-way warning function of the traffic sign recognition system. This is because the system also detects no-entry signs at slip roads of expressways, freeways and traffic circles, and compares them with the information from the navigation system.
The pictures recorded by the multifunction camera are compared with stored data records by the picture recognition module. The detected traffic signs are matched to the respective valid road traffic regulations.
As of the market launch of model 223, the system also detects right-of-way signs (stop signs or yield signs) and warns the driver optically or optically and acoustically using a two-stage warning up to a speed of approx. 70 km/h.
Information on current signs is also provided to other driver assistance systems, such as ECO Assist.
Warnings about pedestrians on pedestrian crossings and warnings about unintentionally driving past stop signs can be activated or deactivated by the driver (permanently) in the Driving Assistance menu of Traffic Sign Assist. The type of warning and the warning threshold can also be adjusted. However, country-specific warnings about driving against the prescribed direction of travel are permanently active.
| Function schematics | |||
| Recognize traffic signs, function schematic | Model 118, 167, 177, 243, 247, 293 except code 233 (Adaptive cruise control Plus (DISTRONIC PLUS)) except code 51B (Rating, country group EURO-NCAP) | PE54.30-P-2502-97A | |
| Model 118, 167, 177, 243, 247, 293 with code 233 (Adaptive cruise control Plus (DISTRONIC PLUS)) Model 118, 167, 177, 243, 247, 293 with code 51B (Rating, country group EURO-NCAP) | PE54.30-P-2502-97B | ||
| Model 213, 238, 257, 290 as of model year 2021 | PE54.30-P-2502-97E | ||
| Model 223, 297 | PE54.30-P-2502-97C | ||
| Model 192, 206, 214, 232, 254, 294, 295, 296 | PE54.30-P-2502-97F | ||
| Additional basic functions | |||
| Front multifunction camera, basic function | GF54.71-P-9890A | ||
| Detailed information | |||
| Functional limitations of traffic sign recognition, detailed information | Model all (CAR) with code 504 (Speed sign recognition) Model all (CAR) with code 513 (Road sign recognition system) |
GF54.30-P-0021-01A | |
| Traffic sign recognition, detailed information | Model all (CAR) with code 504 (Speed sign recognition) Model all (CAR) with code 513 (Road sign recognition system) |
GF54.30-P-0022-01A |