Triangle road sign side 90 in iron class 1 fig. 390 "unstable material on the road"

Technical features:

• Shape: Equilateral Triangular

• Side: 90 cm

• Suitable size for secondary or urban roads with heavy traffic.

• Material: Galvanized or pre-painted iron sheet

• High resistance to atmospheric agents (rain, sun, frost), treated to ensure durability over time.

• Reflectivity class: Class 1

• Base reflective film, compliant with Italian regulations for visibility in standard day and night conditions.

• Figure code: Fig. 390 according to the Regulations for the execution and implementation of the Highway Code (Presidential Decree 495/1992).

• Type: Permanent danger sign.


Signal Meaning:

• The sign "Unstable material on the road" (fig. 390) warns of the possible presence of loose material on the roadway, which may constitute a danger to traffic, especially for two-wheeled vehicles or when cornering.

• The material can be:

Gravel

Sand

Crushed stone

Leaves, mud or natural debris

Residual grit from road works

• This sign is often used in mountainous areas, road construction sites, landslide-prone sections, or in areas where roadway maintenance may cause loose material to be deposited.


Graphic appearance:

• Yellow background

• Red frame

• Inside, a black car is depicted tilting, from which splinters or black pebbles start, symbolizing the detachment and projection of material from the road surface.


Common Applications:

In correspondence with:

• Road sections under maintenance or recently paved

• Curves with gravel or loam deposit

• Areas at risk of landslides

• Dirt or semi-paved roads

• Often supplemented with a supplementary panel that indicates:

• The extension of the dangerous section (e.g. "for 500 m")

• Speed restrictions or precautionary statements


Regulatory references:

• Highway Code – Art. 39 (Vertical signs)

• Implementing Regulation – Annex II, Figure 390

• Complies with European and Italian standards for permanent vertical markings