Riders must constantly watch out for road hazards that effect traction or could otherwise find themselves in an accident very quickly. Usually sand on the road does not bother a car that much at all because 3 other tires still have traction. Motorcycles are very sensitive to traction issues as shown in the following video.
At 0:25 and especially at 0:40 my son almost slid out into a high side accident because the rear wheel got very squirrelly in the sand on the road. Hitting sand while the bike is leaned over is a killer because the road friction or traction is keeping the rear tire from sliding out. Thanks for watching and enjoy your ride!