Eric explains the colors thus:
Black is less than 7mph. Red is less than 19mph. Blue is less than
43mph. Green is above that. The day is the 24 hours just before I posted
Quibble: The red, of course, is too big a range. An average speed of 19 mph is very high for a local-stop bus in traffic, but 7 mph is pathetic, so it would have been more useful to divide that segment up more.
The green lines correspond to freeways, including some where there is no transit service, so these probably represent buses running empty to and from the garage. (“Deadheading” is the sexy insider term for that activity, if you want to impress your friends. I believe the term predates the Grateful Dead.)
And of course, these are just in-vehicle operating speed, which doesn’t account for the impact of frequency on your actual travel experience.
Still, I think we’re just seeing the beginning of the mapping and analysis of real-time information data, analysis that you can do at home. There’s no longer any need to wait for something like the San Francisco Transit Effectiveness Project to assess your transit system’s effectiveness, in 25 different ways, in visceral color.