Honda Civic Owners Manual: RDM Conditions and Limitations

The system may not properly detect lane markings and the position of your vehicle ►nder certain conditions. Some examples of these conditions are listed below.

 Environmental conditions

•  Driving in bad weather (rain, fog, snow, etc.).
•  Sudden changes between light and dark, such as an entrance or exit of a tunnel.
•  There is little contrast between lane lines and the roadway surface.
•  Driving into low sunlight (e.g., at dawn or dusk).
•  Strong light is reflected onto the roadway.
•  Driving in the shadows of trees, buildings, etc.
•  Shadows of adjacent objects are parallel to lane markings.
•  Roadway objects or structures are misinterpreted as lane markers.
•  Reflections on the interior of the front windshield.

Roadway conditions

•  Driving on a snowy or wet roadway (obscured lane marking, vehicle tracks, reflected lights, road spray, high contrast).
•  Driving on a road with temporary lane markings.
•  Faint, multiple, or varied lane markings are visible on the roadway due to road repairs or old lane markings.
•  The roadway has merging, split, or crossing lines (e.g., such as at an intersection or crosswalk).
•  The lane markings are extremely narrow, wide, or changing.
•  The vehicle in front of you is driving near the lane lines.
•  The road is hilly or the vehicle is approaching the crest of a hill.
•  Driving on rough or unpaved roads, or over bumpy surfaces.
•  When objects on the road (curb, guard rail, pylons, etc.) are recognized as white lines (or yellow lines).
•  Driving on roads with double lines.

Vehicle conditions

•  Headlight lenses are dirty or the headlights are not properly adjusted.
•  The outside of the windshield is streaked or blocked by dirt, mud, leaves, wet snow, etc.
•  The inside of the windshield is fogged.
•  The camera temperature gets too high.
•  An abnormal tire or wheel condition (wrong sized, varied size or construction, improperly inflated, compact spare tire, etc.).
•  The vehicle is tilted due to a heavy load or suspension modifications.
•  When tire chains are installed.