National technical regulation QCVN 41:2024/BGTVT on road signaling issued under Circular 51/2024/TT-BGTVT takes effect from January 1, 2025.
There are many rare traffic signs in this standard. Typical examples are as follows:

According to the standards, the above traffic signs have the meaning of warning of obstacles in front and guiding the direction.
IE.468a is shown to the left.
IE.468b license plates can go in both directions.
IE.468c license plate shows to go in the right direction.

The above traffic signs show obstacles in front, including black crossbars arranged on a background of fluorescent yellow.
Traffic signs No. IE.469 (ultra reflective) show the direction to remind drivers to prepare to change direction when approaching a dangerous curve with a small curved radius. The sign is placed at the back of the curve, 0.5 m from the edge of the road or on the median strip for a road with two separate traffic directions. The installation distance of license plate No. IE.469 depends on the curved radius and the speed of traffic on the branch turning off the highway.

Traffic sign W.212 has a narrow warning meaning.
To announce the upcoming narrow bridge, the bridge is a bridge with a width of less than or equal to 4.5 m, with the bridge sign W.212 of the narrow bridge. When crossing these bridges, drivers must move slowly, observe, give way to each other and stop at both ends of the bridge.