NAIROBI — Kalpesh Manilal Solanki enjoys driving on the modern expressway in Nairobi, the capital of Kenya, up to eight times daily to attend business meetings and run personal errands. The 27.1-kilometer Nairobi Expressway, built by a Chinese firm under a public-private partnership model, marked a milestone of on Tuesday by vehicles that have driven on it since its trial operation began in May 2022. Solanki had glowing words for the modern thoroughfare, often described as an iconic infrastructure, thanks to the vitality it has injected into his enterprise. (....)