GENERAL

Guardrail markers and concrete barrier markers to be used for various types of delineation shall meet the requirements of Article 4186.12. Approved Products are listed in the Materials Approved Products Listing Enterprise (MAPLE). Use ASTM D 4956 Type XI sheeting on markers for Interstate and primary projects.

ACCEPTANCE

Acceptance of guardrail markers and concrete barrier markers will be on the basis of manufacturer and brand name approval. Iowa Department of Transportation projects will use Type XI sheeting on the markers.

MANUFACTURER & BRAND NAME APPROVAL

To obtain approval for guardrail markers and concrete barrier markers under Appendix A, the manufacturer shall submit the following items to the Construction and Materials Bureau in Ames, Iowa:

1. Product identification including brand name and product number

2. Complete manufacturer recommendations for usage

3. Product samples consisting of two markers of each color

Approval of guardrail markers and concrete barrier markers may be withdrawn because of deficient monitor test results; product changes made after original approval, or unsatisfactory field performance.

MONITOR SAMPLING & TESTING

The Construction and Materials Bureau may sample and test guardrail markers and concrete barrier markers to verify compliance with specifications. Samples for continued product approval may be requested from the manufacturer.