U-21 sign, reflective foil of the first generation
The U-21 driving signs are covered with reflective foil with oblique, white and red ones. The product is used to protect road works.
Signs should be positioned so that the stripes fall towards the part of the road in use. To mark the limited gauge on the right side of the roadway, use the U-21b plates, and on the left side of the roadway U-21a. It is allowed to use U-21a and U-21b driving plates with warning lights located above the plates. The plates are placed in the road bases.
Arrays are used to denote:
- a narrowed lane, e.g. during road works
- occupied or understated (over)wagering
- temporary marking of cavities in the roadway (holes in the asphalt).
