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The 18" x 18" Orange Engineer Grade Prismatic Reflective Aluminum Bike Lane Sign (DOT W5-4a) is a warning sign designed to alert cyclists and motorists that a bicycle path is narrowing ahead. This diamond-shaped sign features the standardized DOT W5-4a "Path Narrows" symbol on a high-visibility orange background, providing clear advance warning in bike lanes, shared-use paths, and multi-use trail environments.
Built on a durable aluminum substrate with Engineer Grade Prismatic reflective sheeting, this sign delivers reliable visibility in both daylight and low-light conditions. The aluminum construction resists corrosion and weathering, making it suitable for long-term outdoor installation in municipal bike infrastructure, park trails, and roadway bike lane applications. The reflective sheeting meets MUTCD standards for warning signs, ensuring compliance with federal traffic control device requirements.
Key Features
DOT W5-4a Designation — Standardized "Path Narrows" symbol for consistent communication across bike infrastructure.
Engineer Grade Prismatic Sheeting — Reflective surface provides visibility in headlight illumination and low-light conditions.
Aluminum Substrate — Corrosion-resistant material withstands outdoor exposure and temperature fluctuations.
18" x 18" Diamond Format — Standard warning sign size for bike lane and path applications per MUTCD guidelines.
High-Visibility Orange — Warning color alerts path users to changing conditions ahead.
Applications
This sign is used by municipal public works departments, parks and recreation agencies, DOT contractors, and trail management organizations to warn cyclists of narrowing path conditions. Install it in advance of constrictions caused by bridge approaches, bollards, gate access points, or natural terrain features where the bike lane or shared-use path width decreases.
Compliance & Standards
Meets Manual on Uniform Traffic Control Devices (MUTCD) standards for bicycle warning signs. Engineer Grade Prismatic reflective sheeting complies with ASTM D4956 Type I specifications.
