Uber's $1.2bn series D round has demonstrated again the excitement surrounding the mobility sector at present, and the ride sharing market in particular.

Ride sharing company Uber’s closing of a $1.2bn series D round that valued it at more than $18bn and wildly outstripped expectations about the size of the round made only last month, has helped to illustrate the explosive growth in the mobility market occurring right now.

Uber, which had raised $258m from Google Ventures, TPG and Benchmark at a $3.5bn valuation only last year, secured the cash from an undisclosed collection of institutional investors, mutual funds, private equity and venture…