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ASIAN DEVELOPMENT BANKADB SUSTAINABLE DEVELOPMENT WORKING PAPER SERIESNO. 106June 2025RECYCLED PLASTIC WASTE IN PAPUA NEW GUINEA’S ROAD INFRASTRUCTURESyed Hussain Haider and Filippo GiustozziASIAN DEVELOPMENT BANKADB Sustainable Development Working Paper SeriesRecycled Plastic Waste in Papua New Guinea’s Road InfrastructureSyed Hussain Haider and Filippo GiustozziNo. 106 | June 2025Syed Hussain Haider is a principal transport specialist at the Transport Sector Office, Sectors Group, Asian Development Bank with a vast experience in transport projects in the Pacific region.Filippo Giustozzi is a professor of civil engineering and an experienced leader in road and airport pavements dedicated to advancing the transport infrastructure sector.The ADB Sustainable Development Working Paper Series presents data from ongoing research to encourage exchange of ideas and elicit comment and feedback about development issues in Asia and the Pacific. The views expressed are those of the authors and do not necessarily reflect the views and policies of ADB or its Board of Governorsor the governments they represent. Creative Commons Attribution 3.0 IGO license (CC BY 3.0 IGO)© 2025 Asian Development Bank6 ADB Avenue, Mandaluyong City, 1550 Metro Manila, PhilippinesTel +63 2 8632 4444; Fax +63 2 8636 2444www.adb.orgSome rights reserved. Published in 2025.ISSN 2789-0619 (print), 2789-0627 (PDF)Publication Stock No. WPS250189-2DOI: http://dx.doi.org/10.22617/WPS250189-2The views expressed in this publication are those of the authors and do not necessarily reflect the views and policies of the Asian Development Bank (ADB) or its Board of Governors or the governments they represent.ADB does not guarantee the accuracy of the data included in this publication and accepts no responsibility for any consequence of their use. The mention of specific companies or products of manufacturers does not imply that they are endorsed or recommended by ADB in preference to others of a similar nature that are not mentioned.By making any designation of or reference to a particular territory or geographic area in this document, ADB does not intend to make any judgments as to the legal or other status of any territory or area.This publication is available under the Creative Commons Attribution 3.0 IGO license (CC BY 3.0 IGO) https://creativecommons.org/licenses/by/3.0/igo/. By using the content of this publication, you agree to be bound by the terms of this license. For attribution, translations, adaptations, and permissions, please read the provisions and terms of use at https://www.adb.org/terms-use#openaccess.This CC license does not apply to non-ADB copyright materials in this publication. If the material is attributed to another source, please contact the copyright owner or publisher of that source for permission to reproduce it. ADB cannot be held liable for any claims that arise as a result of your use of the material.Please contact pubsmarketing@adb.org if you have questions or