Keep in mind the bike wasn't beamed onto the road from the Starship Enterprise moments before the crash.
If the bike was laying on the road, then the driver wasn't looking far enough ahead, or was over-driving the visibility. Perhaps not paying attention to other vehicle's movements.
If the bike fell off of the car in front of them, then the following vehicle hadn't looked at the load, and was likely following too closely.
If it did fall off a vehicle moments earlier, it might still be bouncing, and could take out the grill, radiator, or perhaps even the windshield.
Adequately paying attention, one could avoid the obstacle without any extreme avoidance maneuvers.