You can calculate speed from the frequency change in the sound. Jap motorcycles are like that, not guttural like Milwaukee-made, instead that high keening, small-animal sound. This the sound that drew my attention as I saw him emerge from the tree line along the town road.
I started to count; one steam engine, two steam engine, three steam engine, four steam … then he and the motorcycle disappeared behind my neighbor’s house. An eighth of a mile in three-point-five seconds.
A seven-second quarter good for a shade over 120 mph, on this Yamaha if maybe a Kawasaki road rocket. One hundred and twenty on a town road with driveways, blind intersections, tractors, combines, sprayers, kids on bikes.
A seven-second quarter is a cool sensation, I have been there a few times myself. To confess Highway 51 one early morning, but enough years ago that the statute of limitations has expired, somewhere on the Buena Vista south of Coddington Station.