Two years ago I had to make many traffic surveys along a big road in Rovigo city during the rush hours: in the early morning and in the late afternoon. I simply had had to count the numbers of cars and long vehicles in the two directions of travel and in preset positions and times (15 minutes per station). To do this I wrote a Python program for my phone: a Nokia N78 (equipped with Symbian 60v3). Here is the full story, code and how it worked.
The work was easy but stressful and repetitive: