Published: July 29 2012

For the past few months I’ve been using Sidecar whenever I’m in SF. The service is a sort of Uber meets Gypsy cabs, allowing ordering on-demand everyday drivers, who will give you a ride across town at a price comparable or slightly cheaper than a Taxi.


A post about the service’s legal standing is probably worthwhile but not for me to write. Should you use Sidecar? Yes, if you’re looking for Uber-like service at Taxi-like prices and aren’t made uncomfortable by just how sketchy the whole thing feels. The service is invite-only for now, but if you’re in SF: here, have an invite (and 10 bucks).

The Reputation of ETAs

I am fascinated by digital reputation systems, having focused on them in my senior thesis.

Wait times matter. In the taxi world (where a few of the drivers I’ve met come from), operators keep track of passengers who repeatedly order cabs and then don’t show up. After a couple of no-shows, a phone number or address gets the equivalent of Hellbanned - if they order a cab again, the operator will tell them the cab is on its way and then just not send anybody, leaving the passenger stranded. It’s a cruel sort of system, but in lieu of a real-world consumer reputation system, it’s the only way I can think of for a cab company to punish poor behavior, like a waiter spitting in food.

In Sidecar’s reputation system, a passenger is rated 1-5 by drivers, but only once a ride is complete. A cancelled ride, then, is not globally stored within Sidecar’s system, at least in a way visible to drivers. The driver that was telling me this story compensates by “just remembering people” once they have skipped out on a ride or two. In one case, he accepted a ride that claimed to be fifteen minutes away and proceeded to “walk into a deli, order a sandwich and some chips, make small-talk with the owner, and then eventually come pick the guy up.”

The Solution

In Sidecar’s case, I propose a reasonably straightforward solution: give passengers a reasonable window within which to cancel (90 seconds? 120?). If they don’t cancel, add the notification to their reputation system (late-cancelled 6% of Sidecars). Let both parties know that this is criteria that drivers will see. You’ll get fewer cancellation and fewer drivers having to “remember people” and punish them passive-aggressively.