Design is about practically imagining what could be rather than what already is. In the last 20 years transport planning has been challenged to shift from an approach of responding to ‘what is’ to seeking ‘what could be’; the trouble is that this process has proved to be very messy and no coherent vision has emerged as to what the ‘could be’ should be. This is problematic for designers in the transport industry, because they can find themselves working to conflicting and shifting design specifications.