Travel time along a 13 km stretch of Nairobi’s Outer Ring Road has been eased considerably, with the opening of the two-lane dual carriageway in early 2019. This road improvement was thanks to an AfDB-funded project that was launched in 2015. As a bonus, the intervention led to reduced road fatalities, encouraged the establishment of new businesses, and restored security for the people who use the road. These outcomes come as no surprise given that the project was found to have had good “Quality at Entry” by a recent IDEV evaluation. This case study will argue that in particular evaluability and implementation readiness are the key quality at entry factors that can lead to a greater likelihood of project success.