Mobile phones by hour of day, day of week

This is a pretty big image -it's the phones by hour by day table presented as a graph; every day appears side-by-side. Follow the link to see it at a resolution where it works.

Some immediate observations

• Nobody walks around between 0400 and 0600.
• The rest of the time, the streets are busy.
• Friday and Saturday night are when people stay out late -so late that Saturday and Sunday Mornings are peak hours beween 0000 and 0400.
• Weekday traffic peaks in the morning between 0700 and 1100. There's a quieter spot, a busy lunchtime, then another quiet spot. But not much in it -traffic throughout the day is fairly constant.
  
• Peak evening times - monday to thursday- are from 1500 to 1800
• Less people come past at that time on a Friday -instead traffic is higher later on in the day. Possibly going straight from work/study to enjoy themselves, coming back afterwards.
• Sat and Sun have later starts, but their mid-day traffic is on a par with weekday midday traffic
• Saturday and Sunday's traffic levels seem the most mathematically "normal": traffic goes up, peaks mid-afternoon, then declines. On weekdays, office/study/school hours interfere.
• Monday is the quietest. Less people out at in the early morning, less people on every hour.

More complex work would break it up by phone: identify who was returning; also do some grouping tricks to identify students by term times and then then see if their phones have a significant different grouping.