BAD MATH=BAD RHETORIC. One of the joys of Gregg Easterbrook’s Tuesday Morning Quarterback column on espn.com [see link at left] is that it is only nominally a football column. While it reliably has some football content, Easterbrook also riffs on things like potential slogans for government agencies, Star Trek, and Catherine Bell. He nicely blends the wonky with the footbally. And he’s a smart guy, so when he gets something factually wrong, it incenses loyal readers to a degree that some may think disproportionate. This week, he rants about how Segways are going to be dangerous, and backs it up with bad math and a bad analogy:
“Everyone who walks will intensely hate Segways. The manufacturer has already persuaded 32 states to certify these monstrosities for use on sidewalks; without that permission, no one would buy one. But the Segway is 200 pounds of metal with a 200-pound rider atop moving 12 mph, velocity of someone who runs track in the 100-meter event. This means a pedestrian struck by a Segway will be hit by 400 pounds moving at sprinter speed. Being struck by a Segway roaring down the sidewalk will be significantly worse than being popped by an NFL linebacker at maximum warp.”
Um, wrong. Simple math: the record for the 100m sprint is less than 10 seconds. 1000m = 1km, so 1 km in 100 seconds. 1 mile = 1.609 km, so round up and say an Olympic sprinter runs a mile in 161 seconds, or 2.68 minutes. 60 minutes in an hour divided by 2.68 minutes to the mile = 22.38 mph, way faster than a Segway. 12 mph is about what Khalid Khannouchi averages for the marathon. And Segways don’t weigh 200 pounds, they weigh more like 83 pounds.
I still haven’t tried a Segway, so have no opinion on their safety (but they’re fascinating both as a gadget and as a cultural meme), but the manufacturer says they can stop on a dime, which of course sprinters and linebackers can’t. And they’ve got speed settings, including a “sidewalk” maximum speed setting of 8 mph, but of course users cannot be trusted to abide by those guidelines.