What does an electronic highway message board with an amber dot in each corner indicate?

An electronic highway message board displaying an amber dot in each corner serves as a visual alert for drivers about important road conditions or warnings. In this case, the specific indication of the shoulder being closed is crucial for ensuring safety on the road. The presence of amber dots typically signifies that there is a non-standard condition that drivers need to be aware of, often involving some sort of hazard or obstruction.

When encountering such an alert, drivers are encouraged to remain vigilant and may need to adjust their driving behavior accordingly. This could involve moving away from the shoulder area, ensuring they don’t rely on it for stopping or pulling over, which is particularly important in scenarios where emergency vehicles might need access or where maintenance work is being conducted.

This specific meaning distinguishes the amber dots from other messaging that is used on electronic boards, which may indicate different conditions or changes such as speed limits or open lanes.