I see this often. Going that much faster means an average car still in the other lane simply will not be in the motorcyclists lane at all before the bike passes. The bike will pass while the car just has its tires on the line. The motorcyclist is looking ahead for vehicles already in the same lane. Higher risk? Obviously. But I'm tired of people acting like they're a victim because a bike blasted by and they think "I could have killed that biker" (or "that biker could have killed themselves on my car") while barely on their second signal flash. They traveled 10 car lengths, you got your tires on the lane, they pass, you complete your lane change, they're now 30 car lengths ahead.

That situation does not crash the bike into the changing car. It either makes the bike swerve out into a median or the bike passes without incident. The actual cause of speeding bike crashes in traffic is weaving when dipshits riders switch lanes and inadvertently box themselves into a dead end.

Want to avoid lane-change crashes of any type? Change lanes smoothly and predictable. Use your signal, take 4 seconds to change on the highway, and do not swerve to grab the faster lane every 15 seconds. Be predictable, go home without a collision report. You don't have to give motorcycles special treatment but collision avoidance works the same.