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Lesson
Border crossing points (BCPs) will risk becoming stranded assets in the face of border disputes and other related issues. BCPs completed under the project have remained closed for traffic since April 2021 following a border dispute between the Kyrgyz Republic and Tajikistan. By May 2024, around 10% of the border line with total estimated length of 970 kilometers remained to be delimitated. The countries are determined to complete the process and sign a border agreement within 2024. Until the delimitation is completed, the potential traffic volumes across the borders will remain unknown.

Project Number: 46124-001
Project Name: Central Asia Regional Economic Cooperation Regional Improvement of Border Services Project
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Lesson
Flexibility in project design is required to respond to changes in subproject scale and adapt capacity support to the changing needs. This project was implemented across eight provinces, with significant differences in the size and scope of provincial waterworks (PWW) subprojects and local capacities. A flexible design was crucial to its successful implementation.

Project Number: 41403-013
Project Name: Urban Water Supply Project
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Lesson
Performing an adequate level of due diligence and risk assessments at the early stage of project preparation increases the quality of project design and readiness. For example, preparatory work for procurement planning and administration of abnormally low bids (e.g., prequalification of bidders) supports and better streamlines the procurement process and avoids substantial changes in a project design and scope.

Project Number: 44483-023, 44483-024, 44483-026, 44483-027
Project Name: Second Central Asia Regional Economic Cooperation Corridor 2 Road Investment Program (Tranche 3 and Multitranche Financing Facility)
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Lesson
The absence of a financial cost-benefit evaluation for the toll revenue-generating motorway is a methodological weakness. The project completion report (PCR) did not explain why it did not conduct a financial cost-benefit evaluation for the toll revenue-generating motorway. This validation notes that the RRP too did not conduct such evaluation.

Project Number: 48402-001, 48402-002
Project Name: National Motorway M–4 Gojra–Shorkot Section Project and National Motorway M–4 Gojra–Shorkot–Khanewal Section Project - Additional Financing
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Lesson
Inaccurate estimation of quantities in the detailed project reports (DPR), required for project processing in India, can raise project costs at the same time push back construction periods. There was a huge difference between actual quantity requirements based on site-specific conditions and those indicated in this project's DPRs. Because of insufficient estimations in the bill of quantities, contractors had to put a huge claim for the revision of rates and work quantity. Given this, care must be taken in preparing the DPR and estimating quantities.

Project Number: 37143-033
Project Name: North Eastern States Roads Investment Program - Project 2 and Multitranche Financing Facility
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Lesson
Wide time gaps between the finalization of construction cost estimate, initiation of the bidding process, and awarding of contracts should be avoided as these could lead to time and cost overruns. There were significant time gaps of 4–5 years between the finalization of the DPRs, including cost estimates and the completion of the bidding process. Besides causing startup delays, this also led to higher contract costs in comparison to the engineering estimates.

Project Number: 37143-033
Project Name: North Eastern States Roads Investment Program - Project 2 and Multitranche Financing Facility
Report Date:
Lesson
changes in the pavement composition to address climate change and overloading, constructability

Project Number: 46040-003
Project Name: Yunnan Pu'er Regional Integrated Road Network Development Project
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Lesson
Attainment of project benefits not within the project scope but instead are dependent on external factors downgrades project performance evaluation. The design and monitoring indicators included household sewerage connections, which were not part of the subprojects’ scope but were provided by the respective urban local bodies (ULBs). This led to dependence on external factors in the accrual of project benefits, thus impacting the final evaluation.

Project Number: 38254-013, 38254-063
Project Name: North Karnataka Urban Sector Investment Program (Tranche 4 and Multitranche Financing Facility)
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Lesson
Implementing urban infrastructure and providing universal municipal services within growing towns face complex ground-level challenges hence requiring more time for implementation.

Project Number: 38254-013, 38254-063
Project Name: North Karnataka Urban Sector Investment Program (Tranche 4 and Multitranche Financing Facility)
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Lesson
A geo-fabric reinforced seal could be replicated to provide more robust waterproofing and as a strain-alleviating membrane for treating road surface cracks. The geo-fabric reinforced seal installed for a 500 m length of the project road on a pilot basis proved to be an effective spray sealing technique for treating badly cracked and distressed pavements, particularly where crack movements are slow.

Project Number: 40540-014, 40540-017
Project Name: South Asia Subregional Economic Cooperation Road Connectivity Project
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Lesson
EAs and IAs commonly perceive the low-cost option as the preferred option. However, in the case of consultant selection and civil works contractor selection in thisproject, this perception was debunked by poor contractor performance and issues with payment.

Project Number: 47009-002
Project Name: Guangxi Baise Vocational Education Development Project
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Lesson
Potential problems with funding the maintenance of completed subprojects and/or facilities arise when they highly rely on government budgetary allocations that may or may not materialize in the short- and medium-terms. This can lead to poor periodic maintenance, especially for road routine maintenance. In future projects, consideration could be given to performance-based road maintenance contracts where a period of maintenance is included (e.g., 5 years after completion) in the contracts.

Project Number: 43319-022
Project Name: Greater Mekong Subregion East-West Economic Corridor Towns Development Project
Report Date:
Lesson
With the project's investment in improving wastewater treatment, solid waste management and recycling, an opportunity arose to establish and impose full cost recovery tariffs and charges for these activities. Appropriate tariff studies could have been undertaken and with recommendations for replication in other towns.

Project Number: 43319-022
Project Name: Greater Mekong Subregion East-West Economic Corridor Towns Development Project
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Lesson
Difference in the number of affected assets identified at appraisal and the actual count during implementation can lead to delays in safeguards implementation, which can be worsened by the executing agency's lack of capacity and reliance on short-term, limited consulting inputs. There was a 24% increase in the number of affected structures and households during implementation compared to the estimate at appraisal.

Project Number: 38350-013
Project Name: South Asia Subregional Economic Cooperation Road Connectivity Project
Report Date:
Lesson
ADB and the executing agency should agree on all terms related to the payment of vulnerable allowances to affected people during project appraisal. Vulnerable allowances under this project could not be paid on time due to the absence of recognition of ADB's resettlement plan provisions in country practice.

Project Number: 38350-013
Project Name: South Asia Subregional Economic Cooperation Road Connectivity Project
Report Date: