Road Sign A38 – “Tunnel”

Road sign A38 “Tunnel” warns drivers that they are approaching a tunnel or underground passage, where driving conditions may differ from normal road sections.

It indicates limited visibility, possible humidity, echo, and lighting changes, requiring drivers to slow down and exercise caution.

Inside tunnels, stopping, overtaking, and the use of high beams are often prohibited, making this sign a key safety indicator before entry.

Specifications:

• Shape: Equilateral triangle

• Background: White

• Border: Red

• Symbol: Black tunnel opening

• Dimensions: 700 mm (urban), 900 mm (rural), 1100 mm (motorway)

• Material: Aluminum 1.5–2 mm

• Reflective Coating: RA1 / RA2 / RA3

• Durability: UV-resistant, waterproof, corrosion-proof

Sign A38 plays a crucial role in road safety, ensuring drivers adjust their speed and lighting before entering the tunnel.