The Kenyan government initially rejected two proposals from Chinese companies, China Roads and Bridge Corporation (CRBC) and Shandong Hi-Speed Road and Bridge International Engineering (SDRBI), for the expansion of the Nairobi-Nakuru highway due to investment limitations and legal constraints.

• The Public Private Partnership (PPP) Committee initially ranked CRBC as the first-choice bidder.
• CRBC could not invest more than Ksh129 billion due to Chinese government regulations.
• The PPP Act did not permit the necessary project adjustments during negotiations with CRBC, leading to their termination.
• Both companies eventually received approval to undertake a "split-scope" option, with CRBC constructing approximately 81 kilometres and SDRBI building 94 kilometres of the highway.
• The expansion of the Rironi-Mau Summit highway is set to begin in late November this year.