Environmental conditions

1. Driving into low sunlight (e.g., at dawn or dusk).
2. Strong light is reflected onto the roadway.
3. Driving at night, in dark areas such as long tunnels.
4. Driving in bad weather (rain, fog, snow, etc.).
5. Sudden changes between light and dark, such as the entrance or exit of a tunnel or the shadows of trees, buildings, etc.
6. Water is sprayed by or snow blown from a vehicle ahead.

Roadway conditions

1. Your vehicle is strongly shaken on uneven road surfaces.

Vehicle conditions

1. When lighting is weak due to dirt covering the headlight lenses, or there is poor visibility in a dark place due to the headlights being improperly adjusted.
2. The front of the camera is obstructed by dirt, fog, rain, mud, wet snow, accessories, decals, stickers, film, etc.
3. Driving at night or in a dark place (e.g., a tunnel) with the headlights off.
4. There is residue on the windshield from the windshield wipers.
5. The inside of the windshield is fogged.
6. An abnormal tire or wheel condition (incorrect sizes, varied sizes or construction, improperly inflated, compact spare tire, etc.).
7. The vehicle is tilted due to heavy load in the cargo area or rear seats.
8. The suspension has been modified.
9. Tire chains* are installed.
10. The vehicle is towing a trailer.

The position or the condition of the traffic sign

1. The sign is in a place that makes it hard to find.
2. The sign is located far away from your vehicle.
3. The sign is located where it is hard for headlight beams to reach.
4. The sign is on a corner or bend in the road.
5. The sign is faded or bent.
6. The sign is rotated or damaged.
7. The sign is covered with mud, snow, or frost.
8. Part of the sign is hidden by the trees, or is in the shadow of a vehicle or other object.
9. Light (such as a streetlight) is reflected on the surface of the sign, or it is hidden in shadow.
10. The sign is too bright or too dark (electric signs).
11. Small signs (auxiliary signs, etc.).

Other conditions

1. When you are driving at a high speed.

The Traffic Sign Recognition System may not operate correctly, such as displaying signs that do not adhere to the actual regulations for the roadway or do not exist at all in the following cases.

1. A speed limit sign may display at a higher or lower speed than the actual speed limit.

1. There is a supplementary sign with further information such as weather, time, vehicle type, school zone, etc.
2. Figures on the sign are hard to read (electric signs, numbers on the sign are blurred, etc.).
3. The sign is in the vicinity of the lane you are driving in, even though it is not for the lane, such as a speed limit sign situated at an exit or an intersection between the side road and the main road.
4. There are things that look similar in color or shape to recognized objects (similar sign, electric sign, signboard, structure, etc.).