Why drivers don't always see you.

This is what we were taught in the military. All current or ex-service personell will remember why something is seen.

"Shape, shine, shadow, silhouette, sudden movement, surface, spacings."

Wear a reflective jacket (shine and surface) but wear one slightly to big so it flaps about at the arms etc (movement). Headlamp on for the curvy owners (shine). The rest is up to God.

H