It was precisely the same mathematics that doomed me to crash my ST, back in 2019.
I was going about 45 mph and had allowed what I *thought* was adequate following distance to the vehicle (a pickup truck with a cap on the bed, which completely blocked my view of the line of cars ahead of it) in front of me- three to four carlengths, perhaps more, as I remember it.
45 mph = 66 fps.
Absolute minimum stopping distance from 45 mph is 124 feet under ideal conditions. 124 feet is perhaps six carlengths, I reckon.
Partway across a tall, two-lane bridge with no shoulder and traffic in the oncoming lane, I made the poor decision to check speedometer, mirrors, and GPS (not built-in but also not in my line of sight; I had to look down to see it). Such checks were / are a long-ingrained habit, repeated more often than I really need to make them.
In all, I estimate my gaze was diverted from straight ahead for one to two seconds, during which I would have traveled between 66 and 132 feet without looking ahead.
Somewhere in that space of time the pickup truck was forced to slam on its brakes; there had been a chain-reaction panic stop ahead of it.
By the time I looked back up, diagnosed the situation, and started to brake it was far too late.
Remember, I was trailing by only half to two-thirds that amount, assuming that if the truck had to stop I'd have its stopping distance plus my own in which to control the situation.
Because I was not looking ahead at the critical moment that additional space and time were denied me. When I slammed on my brakes in panic mode, I was ejected from the bike. I recall bouncing and rolling and sliding face-down for some few feet.
FORTUNATELY it was to the inboard side of the bridge and not over the side railing, onto the rocks a couple hundred feet below. The bike carried on and crashed against the back bumper of the pickup.
Takeaway lessons:
- ATGATT, ATGATT, ATGATT. My helmet, jacket, and riding pants did what they were supposed to do and protected me. They were all destroyed but no matter, I was unharmed.
- Allow more following distance than you think you need, especially in situations where there is no obvious, credible line of avoidance.
- When in traffic, PAY ATTENTION TO WHAT'S IN FRONT OF YOU ON THE ROAD, not to the electronic gizmos on your bike regardless of whether they're OEM or aftermarket farkles you or someone else added later.