IFB 858 Guardrails 2025 ATTACHMENT B Specifications.pdf

This document is a standard engineering plan from the Colorado Department of Transportation (CDOT) for Guardrail Type 3 W-Beam installation, specifically detailing technical specifications and installation guidelines for various roadside and highway guardrail scenarios. The 19-page technical drawing set, issued on July 4, 2012, provides comprehensive engineering diagrams for multiple guardrail configurations including normal roadside installations, restrictive roadside installations, median terminals, bridge rail transitions, and applications for different road conditions such as embankments, fill construction, cut-to-fill conditions, and various highway types including multilane divided highways.

The technical specifications cover detailed requirements for guardrail components including wood and steel posts, W-beam rail sections, terminal sections, anchor blocks, base plates, and installation parameters. The plans include precise measurements, bolt specifications, material requirements (referencing ASTM standards), and installation guidelines for different road geometries and traffic conditions. Specific details address post spacing, slope considerations, shoulder width variations, median widths, and transition zones, with notes providing additional context for engineers and contractors on proper installation techniques, material selection, and site-specific adaptations. The standard plan provides a comprehensive technical reference for standardized guardrail implementation across different highway and roadway environments.