One choice is to draft up a contract and hire a lot of people. Provide them with GPS units configured to take readings providing the data you need, enough batteries to last the contract, and instructions (plug it in with this cable to upload nightly, email me this file, etc.)
You'd definitely need to write in the contract how you would restrict the distribution of the data and anonymize it to protect it (perhaps providing a rough half-mile radius of exclusion around the points the person indicates are private,) and you might even consider buying insurance against loss. If traces of peoples' activity became public, they would be filled with information such as, "I leave for work every morning at 7:00 and come home every night at 19:00", and a plot would look like a giant asterisk centered on their house saying "rob this place between 8:00 and 18:00." You can see why you'd need to be concerned about privacy and security.
If you think about it, you're asking for some very expensive data. And without a statistically large enough set, it's going to be of dubious value. Think of how different traces would be between a construction worker (a new repetitive commute after every completed building), a postal carrier (a very repetitive and very serpentine route), an office worker (a mostly repetitive direct route), and a tow truck driver (new routes continually.) Socioeconomic status might impact the traces: lower incomes might follow public transit lines more and travel less. Parents of school-aged children might have average higher after-work commuting miles. Not to mention the guy who drives the Google Street View cars.
None of those traces are likely to intersect any of the others in any meaningful way.
The number of unique styles are likely to be finite, but so high as to require a significant budget to obtain. And that would be in just one city.
You might be able to obtain a smaller (cheaper) set of data if you defined your goals better. If you're trying to quantify the various types of patterns, maybe you sample a broad range of people in a variety of cities. If you're trying to figure out who would benefit from mass transit, or where to lay commuter rail corridors, you're probably better off counting cars on the various roadways around the area you're planning to serve and conducting surveys.