The advantages of a motorcycle and apparel that can be easily seen by other motorists are well known. Hurt found significant crash-reduction benefits in both daytime headlights and brightly colored clothing. A 1990s New Zealand study found lower risk of crashing with fluorescent or reflective clothing and white helmets. And anecdotal evidence from net forums recommends all of that plus headlight modulators that produce a pulsating beam of light.
None of which does a bit of good if the line of sight between the motorcycle and potentially interfering traffic is blocked.
In a small Washington city, a rider negotiates the odd S-shaped bend on a main street through town and finds a bus making a left turn from the oncoming lane. Though he brakes hard, he's unable to stop and hits the right rear quarter of the bus before it can finish its turn. Because foliage obstructed the sightline between the motorcycle and bus through most of the bend, the bus driver began to turn before the motorcycle was even in sight. Moreover, the shape of the bend took the rider's focus away from the intersection. By the time he had passed the obstructions and looked toward the intersection, the bus was less than 100 feet away. The rider's speed wasn't reported, but it was too fast for him to stop in the available distance.
In Pennsylvania, a motorcycle traveling behind a van approaches an intersection where a car stopped at a cross street on the right waits to turn left. The van ahead of the motorcycle slows to turn right at the intersection, and the driver on the cross street seizes the opportunity to make his turn. The motorcycle passes the slowing van and collides with the left-turning car. Neither the driver nor the rider saw each other because the van obstructed the sightline.
On a West Virginia thoroughfare with three lanes in each direction, traffic in the #1 and #2 lanes (numbered from left) is at a crawl. To accommodate an oncoming motorist attempting to turn left into a driveway, drivers in those two lanes open a gap to let him through. But he collides with a motorcycle in the #3 lane moving at normal speed. Again, neither the rider nor the driver saw each other because the sightline was blocked.
Conspicuity—or passive visibility—is often emphasized to the exclusion of active visibility, adjusting position and speed to improve the chances of being seen by other motorists. In fact, a rider in a high-viz yellow Aerostich Roadcrafter with a searing, pulsating headlight beam may be lulled into complacency. Unless he is also taking positive action to ensure a clear line of sight between himself and vehicles that could cross his path, he could find himself in one of these situations.
A superior rider uses superior judgment to avoid problems that would demand his superior skill.