Limitations of Intelligent Speed Limit Assist

Intelligent Speed Limit Assist may not operate properly, or it may operate unexpectedly under certain circumstances, including the following:

  • The road sign is contaminated or indistinguishable

    • The road sign is difficult to see due to bad weather, such as rain, snow, fog.

    • The road sign is partially obscured by surrounding objects or shadow

  • The road signs do not conform to the standard

    • The text or picture on the road sign is different from the standard

    • The road sign is installed between the main line and the exit road or between diverging roads

    • A sign is attached to another vehicle such as a construction truck

  • The distance between the vehicle and the road signs is far

  • The vehicle encounters illuminating road signs

  • Intelligent Speed Limit Assist incorrectly recognizes numbers or pictures in the street signs or other signs as the speed limit

  • A road sign near the road you are driving is detected

  • Multiple signs are installed close together

  • The minimum speed limit sign is misidentified

  • The minimum speed limit sign is on the road

  • The brightness changes suddenly, for example when entering or exiting a tunnel or passing under a bridge

  • Headlamps are not used or the brightness of the headlamps are weak at night or in the tunnel

  • The field of view of the front-view camera is obstructed by sun glare

  • Road signs are difficult to recognize due to the reflection of sunlight, streetlights, or oncoming vehicles

  • The navigation information or GPS information contains errors.

  • The driver does not follow the navigation guides.

  • Driving on a road that is sharply curved or continuously curved

  • Driving through speed bumps, or driving up and down or left to right on steep inclines

  • The vehicle is shaking heavily

  • Driving on a new road

  • Driving on a road under construction.

  • When the navigation software updates during driving

WARNING
  • Intelligent Speed Limit Assist is a supplemental function that can help the driver to comply with the speed limit on the road. It is not a substitute for driver attention.

  • It is the responsibility of the driver to obey the speed limit.

  • It may not operate for 15 seconds after the vehicle is started, or the front-view camera is initialized or restarted.

NOTE

For more details on the limitations of the front-view camera, refer to Forward Collision-Avoidance Assist (FCA) (Sensor Fusion).