Both parties will jointly innovate and cooperate on car travel, membership services, financial insurance, blockchain technologies and other fields.
Since late August, Google was reportedly in talks to acquire the company for $30-40 million.
China's high-speed rail network is currently 25,000 kilometers long and accounts for more than 60% of the world's total.
BlaBlaCar has raised $449.6 million in funding to date.
The Shenzhen-based company has ramped up efforts to promote the digitalization of China's public transport sector, and is working with local governments, bus and subway companies to promote its QR code payment.
The bridge will consolidate Hong Kong's position as a hub for multi-destination travel within the Greater Bay Area, which includes nine cities in the Guangdong Province and two Special Administrative Regions.
Following a successful rollout in the UK, Mobilleo hopes to expand operations to France, Belgium, Holland, Spain and Germany.
Didi proposed to set up a new board of directors that consisted of five members, four of which were divided between itself and other investors, while leaving one position to Ofo's founders.
