I've been on holiday again. With photographs:
When I'm driving, I may get caught in traffic or have to divert round
roadworks. If that happens, I don't want to pull in to call whoever's
at my destination; that'll just make me even later, and on the
motorway there aren't many opportunities to stop. But the machinery
that I'm already using to log my trips knows my position anyway…
What's the best way to cross the various bodies of water round
Denmark? Let's check this with actual data.
Where on the road am I five minutes from home?
I have data. I can check this. (Images follow.)
There's one bit of the canonical route to Cambridge where I have a
choice: from the M25, should I leave at junction 21a, 22 or 23 to
reach the A1(M) northbound? If in doubt: data! (Images follow.)
Pretty much every Wednesday evening, I drive to Cambridge and back.
Since I leave at about the same time, I have some fairly consistent
data about traffic patterns. (Images follow.)
I don't like being spied on. But I don't mind gathering my own data.
In July of 2012 I bought a USB GPS receiver (a GlobalSat BU-353, the
cheapest available device that had a good score on the gpsd
compatibility list) for use with a Raspberry Pi, and I have it running
for most car trips I make. (Images follow.)