And yes, in 10 years time there will be no such notion as 'private travel'. Between your phone's GSM/CDMA, bluetooth and wifi signals and dashcams, security and traffic cameras, there will be dozens of parties who monitor every move any person makes outside of their home in urban or suburban areas (be it by car, foot or bike). With different forms of computer vision, that data is sorted and linked to other recordings of objects and there will be dozens of databases that have exact information on where everybody is, 95+% of the time.

One of my pet research projects (although I'm not making much progress in terms of actual work or publications) is on a system of tracking 'people' in a generalized form. It's basically a concept of 'strands' of information along different axises ('location', 'finance', 'internet', 'health' and a few others) which can be joined by an overarching matching algorithm infrastructure. Furthermore, each 'strand' has a 'source' and one can join datasets by deciding 'this source I know is reliable, take this as truth' or from several less trusted ones by using voting or bayesian inference. It's basically a formalization of 'doxing' - an overarching framework to work with personally identifying data from sources of varying degrees of trustworthiness.

I'm sure many people are working on something like this already, but in private and with the goal of using it against 'us' (for a broad definition of 'us'). The only way (ok, maybe not 'only' way, 'one of' the ways) to defend is to acknowledge that privacy is dead and to develop offensive capacities; much like the only last resort against tyranny is a well-armed populace.