The sign you mentioned is called a "Narrowing sign - no oncoming traffic, right lane still 1 lane."

This sign indicates that the road is narrowing ahead. It specifically informs drivers that while the main road will become narrower, there is no oncoming traffic due to the lane configuration. The right lane remains one lane, which likely means that traffic will continue in one direction without the possibility of oncoming vehicles.

When you see this sign, it’s important to be cautious as the lane width decreases, and you should prepare to adjust your driving speed or position accordingly to ensure a safe passage through the narrowed section of the road. Always stay aware of other vehicles around you, especially if you need to change lanes or merge.