Proprietary Product Specifications
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A proprietary product specification is used when a generic description of a desired product or process cannot be easily formulated. It usually contains an "or equivalent" clause to allow for some measure of competition in providing the product. It is generally acknowledged that such a specification severely limits competition which increases cost, it provides very little latitude for innovation and it puts substantial risk on the owner for product performance. Most agencies avoid this type of specification whenever possible. Figure 1 is an example:

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APA
Pavement Interactive. (2021, July 19). Proprietary product specifications. HeadLight. Retrieved [the date you read it], from https://pavementinteractive.org/reference-desk/qc-qa/specifications/proprietary-product-specifications/
ASCE
Pavement Interactive. (2021). “Proprietary Product Specifications.” HeadLight, <https://pavementinteractive.org/reference-desk/qc-qa/specifications/proprietary-product-specifications/> ([the date you read it]).
BibTeX
@misc{pavint-proprietary-product-specifications,
author = {{Pavement Interactive}},
title = {Proprietary Product Specifications},
year = {2021},
publisher = {HeadLight},
howpublished = {\url{https://pavementinteractive.org/reference-desk/qc-qa/specifications/proprietary-product-specifications/}},
note = {Accessed [date]}
}