1) Driving hazard that rolls in 2) Hazy hazard 3) It may roll in at night 
FOGBANK is a code name given to a material used in nuclear weapons such as the W76, W78 and W80. FOGBANK`s precise nature is classified; in the words of former Oak Ridge general manager Dennis Ruddy, `The material is classified. Its composition is classified. Its use in the weapon is classified, and the process itself is classified.` Department......
[n] - a large mass of fog on the sea (as seen from a distance)