These days in San Diego, people most often need ambulances on Thursdays.
Wayne Johnson knows this because he’s the guy responsible for making sure ambulances can show up at your door within 12 minutes of a major emergency. Johnson’s computer takes data from when anyone in the city used an ambulance over the last three years and predicts the busiest days of the week, times of day and locations for emergencies. Johnson deploys a fleet of ambulances across the city accordingly so they’re ready when the call comes.
Some of these computer predictions make sense: The city needs more ambulances in the afternoon and evenings than overnight because more people are out and about. Some of them don’t: Eight months ago, Saturday was the busiest day of the week, and Johnson has no idea why it changed.
“It’s kind of like a dance,” Johnson said.