for Highway Construction Page 505 of 715 SECTION 617 – DELINEATOR AND MILEPOST ASSEMBLIES
617.01 Description.
Provide and install delineator and milepost assemblies .
617.02 Materials.
Provide materials as specified in: Nonstructural Concrete ................................................................................................................. 509 Rigid Posts for Delineators, Snow Poles , and Milepost s ......................................................... 708.16 Sheet Aluminum ...................................................................................................................... 708.27 Retroreflective Sheeting .......................................................................................................... 712.02 Silk Screen Opaque Inks ......................................................................................................... 712.07 Silk Screen Transparent Inks ................................................................................................... 712.08 Flexible Posts for Delineators .................................................................................................. 712.10 Delineators may have rigid or flexible posts. Use rigid posts if snow poles will be installed. Use Class 30 concrete .
617.03 Construction Requirements.
Set delineators and mileposts plumb. Submit the manufacturer’s written installation instructions for flexible delineator posts. If the milepost location is within 50 feet of an established delineator , remove the delineator.
A.Delineator Assemblies . Delineator types 1, 2, 3, or 4 consist of a delineator post and a delineator. Delineator type 9 assemblies vary in shape and may be attached to concrete barrier, to guardrail posts, or to W-beam guardrail. Attach in accordance with the manufacturer’s written installation instructions. Submit the manufacturer’s written instructions before installation. Attach sheet alumi num with retroreflective sheeting to rigid posts. Attach retroreflective sheeting to flexible posts. Use Type IV or higher retroreflective sheeting.
B.Milepost Assembly. A milepost assembly consists of a concrete foundation , post , and milepost sign. If a precast foundation is used, dig the foundation hole to a dimension larger than the concrete foundation and then backfill and tamp using approved material.
617.04 Method of Me asurement.
The Engineer will measure acceptably completed work per each.
617.05 Basis of Payment .
The Department will pay for acceptable quantities at the contrac t unit prices as follows: for Highway Construction Page 506 of 715 Pay Item Pay Unit Delineators, Type ___ ............................................................................. Each Mileposts, Type ___ ............................................................................... Each for Highway Construction Page 507 of 71 5 SECTION 618 – MARKER POSTS, WITNESS POSTS, AND STREET MONUMENTS
618.01 Description.
Provide and place posts for right of way, reference and project markers, witness posts, and street monuments .
618.02 Materials.
Provide concrete for the posts and street monuments as specified in 509. Use white portland cement for project markers. After the project markers have dried thoroughly, add the lett ers using 2 coats of an approved black paint . Allow the first coat to dry thoroughly before applying the second coat. If light weight aggregates are used, provide aggregates in accordance with ASTM C330. Provide brass caps as specified in 708.28. Provide steel witness posts as specified in 708.16, except the holes may be omitted. Provide cast iron casings that meet the requirements of AASHTO M 306. An approved equal for the cover and casting is acceptable. Provide wood w itness posts of cedar or fir that are well seasoned, straight, and sound. Treat the posts as specified in 710. Paint wood witness posts white with 1 coat of Formula No. 6 and 2 coats of Formula No. 11 as specified in 627.03. Provide fiberglass witness posts that are single piece markers capable of simple, permanent installation by 1 person using a manual driving tool, and resist displacement from wind and vehicle impact forces when properly installed. Provide posts that are a constant “T” cross -section design that provides a flat surface for sheeting application, and a reinforcing rib incorporated longitudinally along the back midsection to provide structural rigidity. Put a p oint on the bottom end of the markers for easier ground penetration. Provide fiberglass witness posts complying with the properties in Table 618.02- 1. Table 618.02 -1 – Fiberglass Post Criteria Property ASTM Test Method Minimum Value Ultimate Tensile Strength D638 20,000 psi Specific Gravity D792 1.7 Weight Percent Glass Reinforcement (Ignition Loss) D2584 50 percent Barcol Hardness D2583 47 Fabricate fiberglass witness posts of a durable, UV light resistant, continuous glass fiber and marble reinforced, and thermosetting composite material that is resistant to impact, ozone, and hydrocarbons within a service temperature range of - 40°F to 140°F. Color the posts uniformly throughout the entire cross -section. Incorporate ultraviolet resistant material to inhibit fading or cracking of the markers on field exposure. Ensure the markers exhibit negligible color fading after 2,000 hours in accordance with ASTM G26.
Source: Idaho Standard Specifications for Highway Construction, 2023 Edition. Pages 541–542 of 768.